[Patch,4.6,AVR,Documentation]: PR50820: Document EIND usage.

[Georg-Johann Lay]

This patch adds description of EIND usage.

This is needed because users are confused about it and some undocumented
caveats and even developers might get confused if there is no clear statement
about EIND usage and limitations.

The patch adds the description as subsubsection to the AVR Options subsection.

Added the description to 4.6 first because 4.6 it to be released soon.

Ok for 4.6 branch?

Johann

	PR target/50820
	* doc/invoke.texi (AVR Options): Add subsubsection to explain EIND
	handling and indirect jump/calls on devices > 128k.

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