Spelling and Punctuation changes are done

checkins changed to check-ins and after Instead there should be a comma

Author: Akshat111999

BreakingChanges.md

@@ -1,12 +1,12 @@
 # Breaking Changes
 
 - **Renaming HoloToolkit-Unity repository to MixedRealityToolkit-Unity** to align with product direction.
-- Technically **all your checkins and redirect links will continue to work as-is** but we wanted to give a better heads up on this.
+- Technically **all your check-ins and redirect links will continue to work as-is** but we wanted to give a better heads up on this.
 - All other dependent repositories will undergo a similar name change.
 - We are **not breaking toolkit folder names and namespaces at this time.**
-- Instead we are taking a staggered approach for breaking changes based on developer feedback.
+- Instead, we are taking a staggered approach for breaking changes based on developer feedback.
 
 | Breaking change description | Notes |
 | --- |  --- |
 | Rename repository to MixedRealityToolkit-Unity. | <ul><li>Recommend you do: $git remote set-url origin new_url.</li><li>Recommend reading: https://help.github.com/articles/renaming-a-repository ; https://github.com/blog/1508-repository-redirects-are-here</li></ul>|
-| Updating toolkit namespace to MixedReality      |  <ul><li>Update folder names, class names and namespace names post 2017.2.0 release.</li></ul>|
+| Updating toolkit namespace to MixedReality      |  <ul><li>Update folder names, class names and namespace names post 2017.2.0 release.</li></ul>|