Apply further grammar, clarity and spelling fixes to PR tips.

Batched suggestions from Ted.

Co-authored-by: Ted Thibodeau Jr <[email protected]>

CONTRIBUTING.md

@@ -76,12 +76,12 @@ other than yourself, is good.
 
 ### Merging Pull Requests
 
-It is recommended to merge PR using a "Rebase merge", rather than a "Squash and merge".
-Merge commits are disabled in order maintain a linear commit history.
-"Rebase and merge" is prefered because it maintains the authorship and commit date information which can be important for determining intellectual property contributions.
+PRs should be merged using a "Rebase merge", rather than a "Squash and merge".
+Merge commits are disabled to maintain a linear commit history.
+"Rebase and merge" is preferred because it maintains the authorship and commit date information which can be important for determining intellectual property contributions.
 
 ## Edit style guide
-The following are style tips when editing the specification.
+The following are style tips when editing the specification:
 - Try to have max of 80 char (do hard wrap, not auto wrap)
-- Indent HTML to the proper level using two-spaces per level.
+- Indent HTML to the proper level using two spaces per level.
 - Left justify prose to the first column