Remove repeated information in -ftree-loop-distribute-patterns doc

We have:

       -ftree-loop-distribute-patterns
           Perform loop distribution of patterns that can be code generated with calls to a library.  This flag is enabled by default at -O2 and higher, and by -fprofile-use and -fauto-profile.

           This pass distributes the initialization loops and generates a call to memset zero.  For example, the loop

...

           and the initialization loop is transformed into a call to memset zero.  This flag is enabled by default at -O3.  It is also enabled by -fprofile-use and -fauto-profile.

Which mentions optimizatoin flags twice and the repeated mention is out of
date, since we enable this option at -O2 as well.

gcc/ChangeLog:

	* doc/invoke.texi (-ftree-loop-distribute-patterns): Remove duplicated
	sentence about optimization flags implying this.

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