Clarify the Commentary section

Combine the version-split Description subsection to one. Assume that the
latest version is now used.

Rename the Changes subsection to Notable Changes. The purpose of this
subsection is to describe shortly what has changed in each major and minor
version bumps. It should not compete with the git-log with detail.

helm-grepint.el

@@ -34,8 +34,6 @@
 ;; - Selects the grep based on context: Inside a git-repository, runs
 ;;   `git-grep', otherwise runs `ag'.
 ;; - Uses helm to select candidates and jumps to the given line with RET.
-
-;; And the following additional problems (as of version 1.2.0):
 ;; - A second interactive function `helm-grepint-grep-root'.  This runs the
 ;;   grepping inside a root directory.  By default this has been defined for
 ;;   the git-grep where it greps from the git root directory.
@@ -53,11 +51,6 @@
 ;;         (global-set-key (kbd "C-c g") #'helm-grepint-grep)
 ;;         (global-set-key (kbd "C-c G") #'helm-grepint-grep-root)
 
-;; The original configuration (i.e. without the above additional features) is
-;; available with the following:
-
-;;         (helm-grepint-set-default-config)
-
 ;; ### Key bindings within helm
 
 ;; - `RET'/`F1' selects an item and closes the helm session.
@@ -73,7 +66,7 @@
 ;; cases are configured.  Also look into `helm-grepint-add-grep-config' for more
 ;; details on what is required for a new grep to be defined.
 
-;; ### Changes
+;; ### Notable changes
 
 ;; Version 1.3.0