docs: Remove Doxygen \brief tags.

Doxygen and the wiki bridge don't need them; they'll both just use the first
line/sentence instead.

Fixes #8446.

src/hidapi/doxygen/Doxyfile

@@ -214,7 +214,7 @@ JAVADOC_BANNER         = NO
 # If the QT_AUTOBRIEF tag is set to YES then doxygen will interpret the first
 # line (until the first dot) of a Qt-style comment as the brief description. If
 # set to NO, the Qt-style will behave just like regular Qt-style comments (thus
-# requiring an explicit \brief command for a brief description.)
+# requiring an explicit command for a brief description.)
 # The default value is: NO.
 
 QT_AUTOBRIEF           = NO