[patch, gas documentation] Describe handling of opcodes for relaxation a bit better

[Thomas Koenig]

Hi,

here's a patch for the documentation that I wish had been in there
before I started looking at this :-) I've also left in the original
advice, although that is much more complex than what I found in
the ports mentioned in the patch.

I've tested this patch with "texi2pdf internals.texi" and
"makeinfo internals.texi" (not sure how to convince the
build script to generate the file).

OK?  And if this (or a modified version) is OK, could somebody
commit this for me?

Best regards

	Thomas
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