docs: Add commas to pattern help section

src/borg/archiver.py

@@ -2269,14 +2269,14 @@ class Archiver:
             wildcards at most.
 
         Exclusions can be passed via the command line option ``--exclude``. When used
-        from within a shell the patterns should be quoted to protect them from
+        from within a shell, the patterns should be quoted to protect them from
         expansion.
 
         The ``--exclude-from`` option permits loading exclusion patterns from a text
         file with one pattern per line. Lines empty or starting with the number sign
         ('#') after removing whitespace on both ends are ignored. The optional style
         selector prefix is also supported for patterns loaded from a file. Due to
-        whitespace removal paths with whitespace at the beginning or end can only be
+        whitespace removal, paths with whitespace at the beginning or end can only be
         excluded using regular expressions.
 
         To test your exclusion patterns without performing an actual backup you can