autoconf-2.57: minor typos in documentation

[Nelson H. F. Beebe]

The info node for autoconf-2.57 in the section ``Checking Run Time
Behavior'' says

 - Macro: AC_RUN_IFELSE (INPUT, [ACTION-IF-FOUND],
          [ACTION-IF-NOT-FOUND], [ACTION-IF-CROSS-COMPILING])
     If PROGRAM compiles and links successfully and returns an exit
     status of 0 when executed, run shell commands ACTION-IF-TRUE.
     Otherwise, run shell commands ACTION-IF-FALSE.

Clearly, the template is wrong: it should have ACTION-IF-TRUE and
ACTION-IF-FALSE instead of  ACTION-IF-FOUND and ACTION-IF-NOT-FOUND.

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