doxygen: enable AUTOBRIEF, drop \brief

Especially for short descriptions, it is annoying to have to type \brief for
every single API doc.

Drop all \brief and enable the AUTOBRIEF feature of doxygen, which always takes
the first sentence of an API doc as the brief description.

Change-Id: I11a8a821b065a128108641a2a63fb5a2b1916e87
diff --git a/Doxyfile.coding.in b/Doxyfile.coding.in
index 7c1a28e..9a0058d 100644
--- a/Doxyfile.coding.in
+++ b/Doxyfile.coding.in
@@ -150,15 +150,15 @@
 # comments will behave just like regular Qt-style comments
 # (thus requiring an explicit @brief command for a brief description.)
 
-JAVADOC_AUTOBRIEF      = NO
+JAVADOC_AUTOBRIEF      = YES
 
 # 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 comments
 # will behave just like regular Qt-style comments (thus requiring
-# an explicit \brief command for a brief description.)
+# an explicit command for a brief description.)
 
-QT_AUTOBRIEF           = NO
+QT_AUTOBRIEF           = YES
 
 # The MULTILINE_CPP_IS_BRIEF tag can be set to YES to make Doxygen
 # treat a multi-line C++ special comment block (i.e. a block of //! or ///