[java/log-levels] Fix breaking change in existing comment (#2333)

* Revert "analyzer-comments/java/log-levels: Updating use substring comment so it tells where to apply substring (#2332)"

This reverts commit 7d6cc7b.

* Add use_substring_method_v2.md

Author: sanderploegsma

Diff for: analyzer-comments/java/log-levels/use_substring_method.md

@@ -1,5 +1,5 @@
 # use substring method
 
-Consider using the [substring][substring-method] method in `%<inMethod>s` to solve this exercise.
+Consider using the [substring][substring-method] method to solve this exercise.
 
 [substring-method]: https://docs.oracle.com/javase/8/docs/api/java/lang/String.html#substring-int-int-

Diff for: analyzer-comments/java/log-levels/use_substring_method_v2.md

@@ -0,0 +1,5 @@
+# use substring method
+
+Consider using the [substring][substring-method] method in `%<inMethod>s` to solve this exercise.
+
+[substring-method]: https://docs.oracle.com/javase/8/docs/api/java/lang/String.html#substring-int-int-