Rename files in custom example folders

... as suggested by @mcornella and @ncanceill.

custom/plugins/custom_plugin/custom_plugin.plugin.zsh

@@ -1,4 +0,0 @@
-# This is an example file to demonstrate the use of custom plugins.
-# It would be loaded if you add it to the plugins Array in your .zshrc file:
-#
-# plugins=(custom_plugin)

custom/plugins/example/example.plugin.zsh

@@ -1,2 +1,7 @@
-# Add your own custom plugins in the custom/plugins directory. Plugins placed
-# here will override ones with the same name in the main plugins directory.
+# This is an example file to demonstrate the use of custom plugins.
+# To load them add them to the plugins Array in your .zshrc file:
+#
+# Plugins placed here will override ones with the same name in the main
+# directory.
+#
+# plugins=(example)

custom/themes/example.zsh-theme

@@ -2,3 +2,5 @@
 #
 # Place your themes in this folder and enable theme
 # by setting ZSH_THEME in your .zshrc file.
+#
+# ZSH_THEME='example'