call out some variables that aren't set during <if>



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two commenters were confused authnprovideralias 
providing special config to authz providers



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In trunk: r1611210 , r1611252, r1611481, r1611919

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Silence compiler warning:
mod_authnz_fcgi.c:580:44: warning: 'orspbuflen'
may be used uninitialized in this function.

Not true but annoying.


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Backport r1513461 to fix some Doxygen warnings/comments, except for the following files which rely on other patches which have not been backported yet:
   - ap_mpm.h: r1493741 
   - http_log.h: r1512819
   - httpd.h: r1426877
   - mpm_common.h: which is already in synch with 2.4
So only mpm_var_buf.h remains. This is however needed in order to backport other doxygen clean-up.

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Improve layout, add trailing '.' in function description, remove unneeded @fn.

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one-liner down first ;)


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