Doc: Corrected some typos
Doc: Updated devices section
Doc: Renamed Keybord Mappings to Keyboard Shortcuts section

Additionally, some minor revisions and text insertions took place.
Doc: Updated and revised User Actions section
Doc: Updated Python Plugins section
Corrected comments in python plugins
Doc: Minor cleanup of Python Plugin section
Doc: Updated the Tips and Tricks section and related images
Doc: Fixed patch command
Doc: Updated GNOME Commander Installation section
Doc: Revised search dialog figure
Doc: Updated Shortcut section
Doc: Initiated Remote Server Connections subsection in Advanced Features
Reassigned the help link in keybord shortcut dialog