Manual.md: make declaration of an example consistent.
Manual.md: make declaration of an example consistent.

-> Replace i.e with Example:
-> Replace Example with Example:
-> also add : to Example that are multiple words like
   'Example for qutebrowser:'

now all examples can be searched with Example.*:

necrophcodr/void-packages,necrophcodr/void-packages,necrophcodr/void-packages,necrophcodr/void-packages,necrophcodr/void-packages