t/README: proposed rewording...

Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/README

@@ -234,17 +234,15 @@ This test harness library does the following things:
 Do's, don'ts & things to keep in mind
 -------------------------------------
 
-Here's a few examples of things you probably should and shouldn't do
+Here are a few examples of things you probably should and shouldn't do
 when writing tests.
 
 Do:
 
- - Put as much code as possible inside test_expect_success and other
-   assertions.
+ - Put all code inside test_expect_success and other assertions.
 
    Even code that isn't a test per se, but merely some setup code
-   should be inside a test assertion if at all possible. Test scripts
-   should only have trivial code outside of their assertions.
+   should be inside a test assertion.
 
  - Chain your test assertions
 
@@ -280,16 +278,15 @@ Don't:
 
  - Break the TAP output
 
-   The raw output from your test might be interpreted by a TAP
-   harness. You usually don't have to worry about that. TAP harnesses
-   will ignore everything they don't know about, but don't step on
-   their toes in these areas:
+   The raw output from your test may be interpreted by a TAP harness. TAP
+   harnesses will ignore everything they don't know about, but don't step
+   on their toes in these areas:
 
    - Don't print lines like "$x..$y" where $x and $y are integers.
 
    - Don't print lines that begin with "ok" or "not ok".
 
-   A TAP harness expect a line that begins with either "ok" and "not
+   TAP harnesses expect a line that begins with either "ok" and "not
    ok" to signal a test passed or failed (and our harness already
    produces such lines), so your script shouldn't emit such lines to
    their output.
@@ -301,9 +298,7 @@ Don't:
 
 Keep in mind:
 
- - That what you print to stderr and stdout is usually ignored
-
-   Inside <script> part, the standard output and standard error
+ - Inside <script> part, the standard output and standard error
    streams are discarded, and the test harness only reports "ok" or
    "not ok" to the end user running the tests. Under --verbose, they
    are shown to help debugging the tests.