Update README.md

Author: osixia

README.md

@@ -21,10 +21,10 @@ Latest release: 0.6.12 - phpLDAPadmin 1.2.3 (with php5.5 patch) - [Changelog](CH
 	- [Fix docker mounted file problems](#fix-docker-mounted-file-problems)
 	- [Debug](#debug)
 - [Environment Variables](#environment-variables)
-	- [Set your own environment variables](#set-your-own environment-variables)
+	- [Set your own environment variables](#set-your-own-environment-variables)
 		- [Use command line argument](#use-command-line-argument)
 		- [Link environment file](#link-environment-file)
-		- [Make your own image or extend this image](#make-your-own image-or-extend-this-image)
+		- [Make your own image or extend this image](#make-your-own-image-or-extend-this-image)
 - [Advanced User Guide](#advanced-user-guide)
 	- [Extend osixia/phpldapadmin:0.6.12 image](#extend-osixiaphpldapadmin0612-image)
 	- [Make your own phpLDAPadmin image](#make-your-own-phpldapadmin-image)