typo in 1.8.2 libc/stdlib/envlock.c

[Joel Sherrill]

I was perusing the code and spotted this typo in 1.8.2 which may
still be there:

DESCRIPTION
The <<stenv>> family of routines call these functions when they need
to modify the environ variable.  The version of these routines supplied
in the library does not do anything.  If multiple threads of execution

It should read "<<setenv>>" not "<<stenv>>".

As this is used to generate the documentation, it is of more concern
than just being in a comment.

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