Updated Docs

[Yathosho]

i noticed a couple of times that the commands in the docs aren't always linked to the description of each command, hence i went through all the command to link them properly. as with previous procedure, i didn't not link a command within the description of the same.

as a side product, i also created this Alphabetic list of NSIS commands, which might become handy in one or the other case.

[Yathosho]

..and here's what has changed

[Yathosho]

alright, kichik told me the docs are generated from .but files. i'm already on overworking these!

[T.Slappy]

Nice job, thanks!