[rcl_action] Minor documentation fixes (ros2#397)

* Update rcl_action Doxyfile

Add reference to rcl tagfile and fix generated tagfile name.

Signed-off-by: Jacob Perron <jacob@openrobotics.org>

* Fix minor doc errors

Signed-off-by: Jacob Perron <jacob@openrobotics.org>

rcl_action/Doxyfile

@@ -26,7 +26,8 @@ INPUT                  += ./src/rcl/arguments.c
 # Tag files that do not exist will produce a warning and cross-project linking will not work.
 TAGFILES += "../../../../doxygen_tag_files/cppreference-doxygen-web.tag.xml=http://en.cppreference.com/w/"
 # Consider changing "latest" to the version you want to reference (e.g. beta1 or 1.0.0)
+TAGFILES += "../../../../doxygen_tag_files/rmw.tag=http://docs.ros2.org/latest/api/rcl/"
 TAGFILES += "../../../../doxygen_tag_files/rmw.tag=http://docs.ros2.org/latest/api/rmw/"
 TAGFILES += "../../../../doxygen_tag_files/rcutils.tag=http://docs.ros2.org/latest/api/rcutils/"
 # Uncomment to generate tag files for cross-project linking.
-#GENERATE_TAGFILE = "../../../../doxygen_tag_files/rcl.tag"
+# GENERATE_TAGFILE = "../../../../doxygen_tag_files/rcl_action.tag"

rcl_action/include/rcl_action/rcl_action.h

@@ -14,10 +14,10 @@
 
 /** \mainpage rcl: Common functionality ROS actions
  *
- * `rcl_action` provides a pure C implementation of the ROS concept an \b action.
+ * `rcl_action` provides a pure C implementation of the ROS concept of an \b action.
  * It builds on top of the implementation of topics and services in `rcl`.
  *
- * `rcl_action` consists of functions and structs following ROS action entities:
+ * `rcl_action` consists of functions and structs for the following ROS action entities:
  *
  * - Action client
  *   - rcl_action/action_client.h