actions: Don't run shellcheck if PR message or title was updated

Also fix typos.

.github/workflows/lint-scripts-pr.yml

@@ -1,12 +1,12 @@
-name: Lint On Scripts
+name: Lint on Scripts
 #
-# Run ShellCheck on all scripts and generates report as build artefact
+# Run ShellCheck on all scripts and generate report as build artifact
 #
 
 on:
   workflow_dispatch:
   pull_request:
-    types: [opened, reopened, edited, synchronize]
+    types: [opened, reopened, synchronize]
 
 permissions:
   contents: read
@@ -36,7 +36,7 @@ jobs:
        - name: List all changed files
          run: |
 
-           # use framework internal mechanism for checking `lib` and `extensions` code  only one file is passed,
+           # Use framework internal mechanism for checking `lib` and `extensions` code only one file is passed,
            # and source's are followed, thus the whole project is "understood" by shellcheck.
            # For example, when checking individual files, one variable might be thought "unused" because it
            # is only used in another file, which does not happen when done properly.