More gramatical fixes.

Misc/contribute.md

@@ -426,7 +426,7 @@ Also you can see problem places with the help of the `git diff`:
 
 * [Linus doesn't accept github pull requests](https://github.com/torvalds/linux/pull/17#issuecomment-5654674)
 
-* If your change consists from some different and not too closely related changes, you need to split your changes. Each change must in a separate commit. The `git format-patch` command will generate patches for each commit and subject of each patch will contain `vN` prefix where the `N` is the number of the patch. If you are planning to send not patch, but series of patches, will be good if you will pass `--cover-letter` option to the `git format-patch` command. This will generate additional file that will contain cover letter that you can use to describe what your patchset changes. Also it is good idea to use `--in-reply-to` option in the `git send-email` command. This option allows you to send your patchseries in reply to the your cover message, so the structure of the your patch will be look like this for a maintainer:
+* If your change consists from some different and unrelated changes, you need to split the changes via separate commits. The `git format-patch` command will generate patches for each commit and the subject of each patch will contain a `vN` prefix where the `N` is the number of the patch. If you are planning to send a series of patches it will be helpful to pass the `--cover-letter` option to the `git format-patch` command. This will generate an additional file that will contain the cover letter that you can use to describe what your patchset changes. It is also a good idea to use the `--in-reply-to` option in the `git send-email` command. This option allows you to send your patch series in reply to your cover message. The structure of the your patch will look like this for a maintainer:
 
 ```
 |--> cover letter