+2015-01-30 Oleh Krehel <ohwoeowho@gmail.com>
+
+ * outline.el (outline-font-lock-face): Add docstring.
+ (outline-invisible-p): Improve docstring.
+ (outline-invent-heading): Add docstring.
+ (outline-promote): Improve docstring.
+ (outline-demote): Improve docstring.
+ (outline-head-from-level): Improve docstring.
+ (outline-end-of-heading): Add docstring.
+ (outline-next-visible-heading): Improve docstring.
+ (outline-previous-visible-heading): Improve docstring.
+ (outline-hide-region-body): Improve docstring.
+ (outline-flag-subtree): Add docstring.
+ (outline-end-of-subtree): Add docstring.
+ (outline-headers-as-kill): Improve docstring.
+