docs: fix grammar and spelling

CONTRIBUTING.md

@@ -1,8 +1,20 @@
 # Contributing
 
 - [Code Of Conduct](#code-of-conduct)
+  - [Principles](#principles)
+  - [Violations](#violations)
+  - [Feedback](#feedback)
 - [Submission Guidelines](#submission-guidelines)
+  - [Submitting An Issue](#submitting-an-issue)
+  - [Commenting On A Issue](#commenting-on-a-issue)
+  - [Issue Closure](#issue-closure)
+  - [Issue Re-Opening](#issue-re-opening)
 - [Commit Message Guidelines](#commit-message-guidelines)
+  - [Commit Message Format](#commit-message-format)
+    - [Type](#type)
+    - [Subject](#subject)
+    - [Body](#body)
+    - [Footer](#footer)
 
 ## Code Of Conduct
 
@@ -31,7 +43,7 @@ relations and/or blocking accounts.
 
 ### Feedback
 
-If you are subject to or witness of unacceptable behavior or have any other
+If you are subject to or witness of unacceptable behaviour or have any other
 concerns, please contact us.
 
 ## Submission Guidelines
@@ -63,7 +75,7 @@ Valid reasons for closing an issue:
   -  A reference to the duplicate must be added before closure.
 - Lacks enough information to re-produce.
 - No longer relevant.
-- Off topic.
+- Off-topic.
 - Resolved.
 - Multiple issues within the submission.
 - Will not be resolved.
@@ -122,7 +134,7 @@ Use one of the following applicable type.
 - revert
   - When commit reverts a previous commit.
 - style
-  - Changes that do not affect the meaning of the code (white-space, formatting, missing semi-colons, etc.).
+  - Changes that do not affect the meaning of the code (white-space, formatting, missing semicolons, etc.).
 - test
   - Adding or modifying tests.
 
@@ -137,7 +149,7 @@ Use one of the following applicable type.
 
 - Use the imperative, present tense: "change" not "changed" nor "changes".
 - Include the motivation for the change and contrast this with previous
-behavior.
+behaviour.
 - If commit type is **revert**, in the body state `This reverts commit <hash>`.
 The `<hash>` is the hash value of the commit being reverted.