docs: fix spelling error

Author: lexmin0412

CONTRIBUTING.en-US.md

@@ -14,9 +14,9 @@
 ## Unit Test
 
 - All new features need to have a test case
-- Test cases should be paased if you modified the old code
+- Test cases should be passed if you modified the old code
 
-## Commiting
+## Commit
 
 - All commits need to follow the [angular commit-message-format](https://github.com/angular/angular.js/blob/master/DEVELOPERS.md#-git-commit-guidelines)
 - Linting before committing

README.en-US.md

@@ -10,7 +10,7 @@ a tool generate json schema from typescript.
 ## Feature
 
 - compile Typescript to get all type information
-- convert properties, extendings, annotations, and initial values to jsonschema
+- convert properties, extends, annotations, and initial values to jsonschema
 
 ## Usage
 

docs/index.en-US.md

@@ -1,4 +1,4 @@
-> some examples of type parsement
+> some examples of type resolution
 
 - [Interface](interface.en-US.md)
   - [1.1 Basic Types](interface.en-US.md#11-basic-types)