fixed grammatical mistakes/typos

CONTRIBUTING.md

@@ -48,7 +48,7 @@ We want to fix all the issues as soon as possible, but before fixing a bug we ne
 - version of NestJS-CLI used (`nest info`)
 - and most importantly - a use-case that fails
 
-Unfortunately, we are not able to investigate / fix bugs without a minimal reproduction, so if we don't hear back from you we are going to close an issue that don't have enough info to be reproduced.
+Unfortunately, we are not able to investigate / fix bugs without a minimal reproduction, so if we don't hear back from you we are going to close an issue that doesn't have enough info to be reproduced.
 
 You can file new issues by filling out our [new issue form](https://github.com/nestjs/nest/issues/new).
 
@@ -149,7 +149,7 @@ format that includes a **type**, a **scope** and a **subject**:
 
 The **header** is mandatory and the **scope** of the header is optional.
 
-Any line of the commit message cannot be longer 100 characters! This allows the message to be easier
+Any line of the commit message cannot be longer than 100 characters! This allows the message to be easier
 to read on GitHub as well as in various git tools.
 
 Footer should contain a [closing reference to an issue](https://help.github.com/articles/closing-issues-via-commit-messages/) if any.