Clarify rules

Readme.md

@@ -7,12 +7,20 @@ than a commit where you can count the number of characters changed on one hand.
 
 ### Rules
 
-  - All entries must be a PR.
+  - All entries must be a PR or equivalent.
   - The PR should have as few commits as possible, ideally 1.
-  - Regardless of the number of commits, the final result must be no more than
-    5 characters changed.
-  - The PR must be useful and enhance the repository in an obvious way. Just
-    removing a trailing space at the end of a line is not an enhancement.
+  - Regardless of the number of commits, the final result should be no more than
+    5 changed characters.
+  - The PR must be useful and enhance the program usage in an obvious way. This
+    includes but is not limited to:
+    * Fixing examples in documentation so they run correctly.
+    * Fixing a typo in actual code so it acts appropriately.
+    * Fixing wording in documentation that correctly changes the meaning of the
+      sentence.
+  - Some examples of what doesn't count:
+    * Removing a trailing space from the end of a line.
+    * [Fixing a typo in documentation that does not change the meaning.](https://github.com/netdata/netdata/pull/13514)
+      + Such commits are important and should be made, but they are cosmetic.
   - If the change needs to occur multiple times in a file, it is cheating to
     only do it once.