[patch,doc,avr] ad PR54461: Document --with-avrlibc

[Georg-Johann Lay]

This addendum adds --with-avrlibc to the (web) documentation.

It inserts the explanation after --with-newlib which seems to be a reasonable
place.

Ok to apply?

Johann


	PR target/PR54461
	* doc/install.texi (Cross-Compiler-Specific Options): Document
	--with-avrlibc.
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