i860.h (TARGET_SWITCHES): Add documentation for default case.

i860.h (TARGET_SWITCHES): Add documentation for default case.

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	* i860.h (TARGET_SWITCHES): Add documentation for default case.
	* i860/paragon.h (TARGET_SWITCHES): Add documentation for default case.
	* i370.h (TARGET_SWITCHES): Add documentation for default case.
	* fx80.h (TARGET_SWITCHES): Add documentation for default case.
        * elxsi.h (TARGET_SWITCHES): Add documentation for default case.
	* clipper.h (TARGET_SWITCHES): Add documentation for default case.
	* 1750a.h (TARGET_SWITCHES): Add documentation for default case.
	* pa.h (TARGET_SWITCHES): Add documentation for default case.
	(TARGET_OPTIONS): Likewise for default case.
	* mn10300.h (TARGET_SWITCHES): Add documen for default casetation.
	* h8300.h (TARGET_SWITCHES): Add documentation for default case.

From-SVN: r25890