[libmicrohttpd] fix doc typo: s/USER/USE/ in MHD_USER_THREAD_PER_CONNECTION

[Jim Meyering]

I sent this change before, along with the s/are/is/ change,
but I guess you didn't see it:

Index: doc/microhttpd.texi
===================================================================
--- doc/microhttpd.texi (revision 15482)
+++ doc/microhttpd.texi (working copy)
@@ -269,7 +269,7 @@
 @deftp {Enumeration} MHD_FLAG
 Options for the @mhd{} daemon.

-Note that if neither @code{MHD_USER_THREAD_PER_CONNECTION} nor
+Note that if neither @code{MHD_USE_THREAD_PER_CONNECTION} nor
 @code{MHD_USE_SELECT_INTERNALLY} is used, the client wants control over
 the process and will call the appropriate microhttpd callbacks.

Index: src/include/microhttpd.h
===================================================================
--- src/include/microhttpd.h    (revision 15482)
+++ src/include/microhttpd.h    (working copy)
@@ -306,7 +306,7 @@

 /**
  * Options for the MHD daemon.  Note that if neither
- * MHD_USER_THREAD_PER_CONNECTION nor MHD_USE_SELECT_INTERNALLY is
+ * MHD_USE_THREAD_PER_CONNECTION nor MHD_USE_SELECT_INTERNALLY is
  * used, the client wants control over the process and will call the
  * appropriate microhttpd callbacks.<p>
  *