[PATCH] doc: Fix --debug-level for all versions.

[isis]

Hello GnuPG developers,

While fixing an issue in python-gnupg, [0] it was discovered that GnuPG
(for 1.4.x, 2.0.x, and 2.1.x branches) actually expects to receive the
`--debug-level` argument in the form of `--debug-level=guru`, not
`--debug-level guru` (as the current manuals would lead one to believe).

I believe the fix is just one-line change [1] to `doc/gpg.texi`, which is
attached as a git patch file and separate signature, for your convenience
(although if you'd rather make such a simple change yourselves, I'm fine with
that too).

[0]: https://github.com/isislovecruft/python-gnupg/issues/44
[1]: http://git.gnupg.org/cgi-bin/gitweb.cgi?p=gnupg.git;a=blob;f=doc/gpg.texi;h=b8c4ab1da3fcb05162bb3d22919156f7e0c4573b;hb=HEAD#l2452

Mit herzlichen Grüßen,
-- 
 ♥Ⓐ isis agora lovecruft
_________________________________________________________
GPG: 4096R/A3ADB67A2CDB8B35
Current Keys: https://blog.patternsinthevoid.net/isis.txt
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