i386.c (ix86_function_sseregparm): Fix comment: number of arguments passed to local functions in SSE registers is 3.

	* config/i386/i386.c (ix86_function_sseregparm): Fix comment:
	number of arguments passed to local functions in SSE registers is 3.

	* doc/invoke.texi (Function Attributes) [sseregparm]: Correct
	number of arguments passed in SSE registers to 3.

From-SVN: r118883