re PR ada/15479 (Ada manual problems)

re PR ada/15479 (Ada manual problems)

gcc/ada/:
PR documentation/15479
* gnat_ugn.texi: In non-code, avoid space before colon.
(Regular Expressions in gnatfind and gnatxref): Fix indentation.
(Examples of gnatxref Usage): Use @command{vi} instead of
@file{vi}.
(Character Set Control): Do not use @code for UTF-8.
(Validity Checking): Fix typo "NaNs" instead of "NaN's".  Do not
use @code for IEEE.
* gnat_rm.texi (Aggregates with static bounds): Fix typo in code
sample.
* gnat_rm.texi, gnat_ugn.texi: Fix typos.  Bump copyright years.

From-SVN: r132494