Grammar fixes (#6936)

docs/SnapshotTesting.md

@@ -288,19 +288,19 @@ No, as of Jest 20, snapshots in Jest are not automatically written when Jest is
 
 ### Should snapshot files be committed?
 
-Yes, all snapshot files should be committed alongside the modules they are covering and their tests. They should be considered as part of a test, similar to the value of any other assertion in Jest. In fact, snapshots represent the state of the source modules at any given point in time. In this way, when the source modules are modified, Jest can tell what changed from the previous version. It can also provide a lot of additional context during code review in which reviewers can study your changes better.
+Yes, all snapshot files should be committed alongside the modules they are covering and their tests. They should be considered part of a test, similar to the value of any other assertion in Jest. In fact, snapshots represent the state of the source modules at any given point in time. In this way, when the source modules are modified, Jest can tell what changed from the previous version. It can also provide a lot of additional context during code review in which reviewers can study your changes better.
 
 ### Does snapshot testing only work with React components?
 
 [React](TutorialReact.md) and [React Native](TutorialReactNative.md) components are a good use case for snapshot testing. However, snapshots can capture any serializable value and should be used anytime the goal is testing whether the output is correct. The Jest repository contains many examples of testing the output of Jest itself, the output of Jest's assertion library as well as log messages from various parts of the Jest codebase. See an example of [snapshotting CLI output](https://github.com/facebook/jest/blob/master/e2e/__tests__/console.test.js) in the Jest repo.
 
 ### What's the difference between snapshot testing and visual regression testing?
 
-Snapshot testing and visual regression testing are two distinct ways of testing UIs, and they serve different purposes. Visual regression testing tools take screenshots of web pages and compare the resulting images pixel by pixel. With Snapshot testing values are serialized, stored within text files and compared using a diff algorithm. There are different trade-offs to consider and we listed the reasons why snapshot testing was built in the [Jest blog](https://jestjs.io/blog/2016/07/27/jest-14.html#why-snapshot-testing).
+Snapshot testing and visual regression testing are two distinct ways of testing UIs, and they serve different purposes. Visual regression testing tools take screenshots of web pages and compare the resulting images pixel by pixel. With Snapshot testing values are serialized, stored within text files, and compared using a diff algorithm. There are different trade-offs to consider and we listed the reasons why snapshot testing was built in the [Jest blog](https://jestjs.io/blog/2016/07/27/jest-14.html#why-snapshot-testing).
 
-### Does snapshot testing substitute unit testing?
+### Does snapshot testing replace unit testing?
 
-Snapshot testing is only one of more than 20 assertions that ship with Jest. The aim of snapshot testing is not to replace existing unit tests, but providing additional value and making testing painless. In some scenarios, snapshot testing can potentially remove the need for unit testing for a particular set of functionalities (e.g. React components), but they can work together as well.
+Snapshot testing is only one of more than 20 assertions that ship with Jest. The aim of snapshot testing is not to replace existing unit tests, but to provide additional value and make testing painless. In some scenarios, snapshot testing can potentially remove the need for unit testing for a particular set of functionalities (e.g. React components), but they can work together as well.
 
 ### What is the performance of snapshot testing regarding speed and size of the generated files?
 
@@ -314,6 +314,6 @@ Snapshot files must always represent the current state of the modules they are c
 
 Although it is possible to write snapshot files manually, that is usually not approachable. Snapshots help figuring out whether the output of the modules covered by tests is changed, rather than giving guidance to design the code in the first place.
 
-### Does code coverage work with snapshots testing?
+### Does code coverage work with snapshot testing?
 
 Yes, just like with any other test.