GDP: examples consistency

[Jean-Charles Malahieude]

Hi all docs' contributors and helpers!

First of all I must admit that I al more than a bit lazy, and quite 
nitpicking...

On my way of reviewing the French po file dedicated to the 
documentation, I'm afraid by all these "untranslated" items that appear 
due to some inconsistency in the English version. Since we now can 
translate variable names or comments included in the lilypond examples 
or snippets that are included in the vast material, I would have liked 
not to encounter twice (or more) the same assertion like:

#. Documentation/user/fundamental.itely:1012 (comment)
msgid "Set stems, etc, down"
vs.
#. Documentation/user/fundamental.itely:1074 (comment)
msgid "set stems, etc down"

or

#. Documentation/user/fundamental.itely:2274 (variable)
msgid "sopranoMusic"
vs.
#. Documentation/user/fundamental.itely:1239 (variable)
#. Documentation/user/tweaks.itely:3138 (variable)
msgid "SopMusic"


In other words, I would like that arises a "good practice" in 
documenting things, which would be that the one who deals with a 
specific section adopts a single spelling and/or syntax for each 
equivalent assertion.

Nevertheless, it' true that I could invest some time in tracking and 
modifying those entries, but...

Please forgive me if I'm too bothering, but I think it makes sense.

Cheers
Jean-Charles