doc: remove extraneous "for example" text

No need to announce obvious example code as being example code. Remove
unneeded "for example" text as one small way to try to keep the docs
more concise..

PR-URL: #18890
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Matheus Marchini <matheus@sthima.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Vse Mozhet Byt <vsemozhetbyt@gmail.com>

Author: Trott

doc/api/addons.md

@@ -292,7 +292,7 @@ Each of these examples using the following `binding.gyp` file:
 ```
 
 In cases where there is more than one `.cc` file, simply add the additional
-filename to the `sources` array. For example:
+filename to the `sources` array:
 
 ```json
 "sources": ["addon.cc", "myexample.cc"]

doc/api/async_hooks.md

@@ -451,8 +451,6 @@ Note that `resolve()` does not do any observable synchronous work.
 rejected at this point, if the `Promise` was resolved by assuming the state
 of another `Promise`.
 
-For example:
-
 ```js
 new Promise((resolve) => resolve(true)).then((a) => {});
 ```
@@ -481,8 +479,6 @@ changes:
 * Returns: {number} The `asyncId` of the current execution context. Useful to
   track when something calls.
 
-For example:
-
 ```js
 const async_hooks = require('async_hooks');
 
@@ -493,7 +489,7 @@ fs.open(path, 'r', (err, fd) => {
 ```
 
 The ID returned from `executionAsyncId()` is related to execution timing, not
-causality (which is covered by `triggerAsyncId()`). For example:
+causality (which is covered by `triggerAsyncId()`):
 
 ```js
 const server = net.createServer(function onConnection(conn) {
@@ -517,8 +513,6 @@ See the section on [promise execution tracking][].
 * Returns: {number} The ID of the resource responsible for calling the callback
   that is currently being executed.
 
-For example:
-
 ```js
 const server = net.createServer((conn) => {
   // The resource that caused (or triggered) this callback to be called

doc/api/buffer.md

@@ -930,8 +930,6 @@ added: v8.2.0
 For objects whose `valueOf()` function returns a value not strictly equal to
 `object`, returns `Buffer.from(object.valueOf(), offsetOrEncoding, length)`.
 
-For example:
-
 ```js
 const buf = Buffer.from(new String('this is a test'));
 // <Buffer 74 68 69 73 20 69 73 20 61 20 74 65 73 74>
@@ -940,8 +938,6 @@ const buf = Buffer.from(new String('this is a test'));
 For objects that support `Symbol.toPrimitive`, returns
 `Buffer.from(object[Symbol.toPrimitive](), offsetOrEncoding, length)`.
 
-For example:
-
 ```js
 class Foo {
   [Symbol.toPrimitive]() {

doc/api/child_process.md

@@ -226,8 +226,6 @@ a Promise for an object with `stdout` and `stderr` properties. In case of an
 error, a rejected promise is returned, with the same `error` object given in the
 callback, but with an additional two properties `stdout` and `stderr`.
 
-For example:
-
 ```js
 const util = require('util');
 const exec = util.promisify(require('child_process').exec);

doc/api/dns.md

@@ -114,8 +114,6 @@ Returns an array of IP address strings, formatted according to [rfc5952][],
 that are currently configured for DNS resolution. A string will include a port
 section if a custom port is used.
 
-For example:
-
 <!-- eslint-disable semi-->
 ```js
 [
@@ -369,8 +367,6 @@ function will contain an array of objects with the following properties:
 * `order`
 * `preference`
 
-For example:
-
 <!-- eslint-skip -->
 ```js
 {
@@ -558,8 +554,6 @@ Sets the IP address and port of servers to be used when performing DNS
 resolution. The `servers` argument is an array of [rfc5952][] formatted
 addresses. If the port is the IANA default DNS port (53) it can be omitted.
 
-For example:
-
 ```js
 dns.setServers([
   '4.4.4.4',

doc/api/domain.md

@@ -239,8 +239,6 @@ perhaps we would like to have a separate domain to use for each request.
 
 That is possible via explicit binding.
 
-For example:
-
 ```js
 // create a top-level domain for the server
 const domain = require('domain');

doc/api/errors.md

@@ -292,8 +292,6 @@ console.error(err.message);
 The `error.stack` property is a string describing the point in the code at which
 the `Error` was instantiated.
 
-For example:
-
 ```txt
 Error: Things keep happening!
    at /home/gbusey/file.js:525:2
@@ -368,8 +366,6 @@ detailed [here](#errors_system_errors).
 A subclass of `Error` that indicates the failure of an assertion. Such errors
 commonly indicate inequality of actual and expected value.
 
-For example:
-
 ```js
 assert.strictEqual(1, 2);
 // AssertionError [ERR_ASSERTION]: 1 === 2
@@ -381,8 +377,6 @@ A subclass of `Error` that indicates that a provided argument was not within the
 set or range of acceptable values for a function; whether that is a numeric
 range, or outside the set of options for a given function parameter.
 
-For example:
-
 ```js
 require('net').connect(-1);
 // throws "RangeError: "port" option should be >= 0 and < 65536: -1"
@@ -1298,9 +1292,8 @@ compiled with ICU support.
 <a id="ERR_NO_LONGER_SUPPORTED"></a>
 ### ERR_NO_LONGER_SUPPORTED
 
-A Node.js API was called in an unsupported manner.
-
-For example: `Buffer.write(string, encoding, offset[, length])`
+A Node.js API was called in an unsupported manner, such as
+`Buffer.write(string, encoding, offset[, length])`.
 
 <a id="ERR_OUT_OF_RANGE"></a>
 ### ERR_OUT_OF_RANGE

doc/api/fs.md

@@ -22,8 +22,6 @@ The arguments passed to the completion callback depend on the method, but the
 first argument is always reserved for an exception. If the operation was
 completed successfully, then the first argument will be `null` or `undefined`.
 
-For example:
-
 ```js
 const fs = require('fs');
 
@@ -36,8 +34,6 @@ fs.unlink('/tmp/hello', (err) => {
 Exceptions that occur using synchronous operations are thrown immediately and
 may be handled using `try`/`catch`, or may be allowed to bubble up.
 
-For example:
-
 ```js
 const fs = require('fs');
 
@@ -403,7 +399,6 @@ A `fs.Stats` object provides information about a file.
 Objects returned from [`fs.stat()`][], [`fs.lstat()`][] and [`fs.fstat()`][] and
 their synchronous counterparts are of this type.
 
-For example:
 ```console
 Stats {
   dev: 2114,
@@ -703,9 +698,6 @@ so introduces a race condition, since other processes may change the file's
 state between the two calls. Instead, user code should open/read/write the
 file directly and handle the error raised if the file is not accessible.
 
-For example:
-
-
 **write (NOT RECOMMENDED)**
 
 ```js
@@ -1354,8 +1346,6 @@ so introduces a race condition, since other processes may change the file's
 state between the two calls. Instead, user code should open/read/write the
 file directly and handle the error raised if the file does not exist.
 
-For example:
-
 **write (NOT RECOMMENDED)**
 
 ```js

doc/api/http2.md

@@ -1094,8 +1094,6 @@ received for this stream from the connected HTTP/2 server. The listener is
 invoked with two arguments: an Object containing the received
 [HTTP2 Headers Object][], and flags associated with the headers.
 
-For example:
-
 ```js
 const http2 = require('http2');
 const client = http2.connect('https://localhost');
@@ -2008,8 +2006,6 @@ keys will be serialized to lower-case. Property values should be strings (if
 they are not they will be coerced to strings) or an Array of strings (in order
 to send more than one value per header field).
 
-For example:
-
 ```js
 const headers = {
   ':status': '200',

doc/api/modules.md

@@ -729,7 +729,7 @@ exports = { hello: false };  // Not exported, only available in the module
 ```
 
 When the `module.exports` property is being completely replaced by a new
-object, it is common to also reassign `exports`, for example:
+object, it is common to also reassign `exports`:
 
 <!-- eslint-disable func-name-matching -->
 ```js