Add Doxygen field descriptors for RateControlCfg.

Added field descriptors for RateControlCfg and resolve the
corresponding TODO references in av1_encoder.dox.

Change-Id: I3d653635d5735beed54c036b5f73b0fbc75b1b52
diff --git a/doc/dev_guide/av1_encoder.dox b/doc/dev_guide/av1_encoder.dox
index 04630fa..3e2271f 100644
--- a/doc/dev_guide/av1_encoder.dox
+++ b/doc/dev_guide/av1_encoder.dox
@@ -117,15 +117,16 @@
     - \ref AV1EncoderConfig.two_pass_cfg (\ref TwoPassCfg)
 
 - \ref RateControlCfg (Rate control configuration)
-    - (TODO REF) RateControlCfg.target_bandwidth
-    - (TODO REF) RateControlCfg.best_allowed_q
-    - (TODO REF) RateControlCfg.worst_allowed_q
-    - (TODO REF) RateControlCfg.cq_level
-    - (TODO REF) RateControlCfg.under_shoot_pct
-    - (TODO REF) RateControlCfg.over_shoot_pct
-    - (TODO REF) RateControlCfg.maximum_buffer_size_ms)
-    - (TODO REF) RateControlCfg.starting_buffer_level_ms)
-    - (TODO REF) RateControlCfg.optimal_buffer_level_ms)
+    - \ref RateControlCfg.mode
+    - \ref RateControlCfg.target_bandwidth
+    - \ref RateControlCfg.best_allowed_q
+    - \ref RateControlCfg.worst_allowed_q
+    - \ref RateControlCfg.cq_level
+    - \ref RateControlCfg.under_shoot_pct
+    - \ref RateControlCfg.over_shoot_pct
+    - \ref RateControlCfg.maximum_buffer_size_ms
+    - \ref RateControlCfg.starting_buffer_level_ms
+    - \ref RateControlCfg.optimal_buffer_level_ms
 
 - \ref RATE_CONTROL (Rate control status)
     - \ref RATE_CONTROL.intervals_till_gf_calculate_due
@@ -278,7 +279,7 @@
 
 The value of \ref aom_codec_enc_cfg_t.rc_end_usage is in turn copied over
 into the encoder rate control configuration data structure as
-(TODO REF) RateControlCfg.rc_mode (see \ref encoder.h).
+\ref RateControlCfg.mode.
 
 In regards to the most important use cases above, Video on demand uses either
 VBR or CQ mode. CBR is the preferred rate control model for RTC and Live
@@ -293,12 +294,12 @@
 options together with the names of the corresponding fields in the rate
 control configuration data structures.
 
-- <b>--target-bitrate</b> ((TODO REF) RateControlCfg.target_bandwidth)
-- <b>--min-q</b> ((TODO REF) RateControlCfg.best_allowed_q)
-- <b>--max-q</b> ((TODO REF) RateControlCfg.worst_allowed_q)
-- <b>--cq-level</b> ((TODO REF) RateControlCfg.cq_level)
-- <b>--undershoot-pct</b> ((TODO REF) RateControlCfg.under_shoot_pct)
-- <b>--overshoot-pct</b> ((TODO REF) RateControlCfg.over_shoot_pct)
+- <b>--target-bitrate</b> (\ref RateControlCfg.target_bandwidth)
+- <b>--min-q</b> (\ref RateControlCfg.best_allowed_q)
+- <b>--max-q</b> (\ref RateControlCfg.worst_allowed_q)
+- <b>--cq-level</b> (\ref RateControlCfg.cq_level)
+- <b>--undershoot-pct</b> (\ref RateControlCfg.under_shoot_pct)
+- <b>--overshoot-pct</b> (\ref RateControlCfg.over_shoot_pct)
 
 The following control aspects of 2 pass vbr encoding
 
@@ -309,9 +310,9 @@
 The following relate to buffer and delay management in one pass low delay and
 real time coding
 
-- <b>--buf-sz</b> ((TODO REF) RateControlCfg.maximum_buffer_size_ms)
-- <b>--buf-initial-sz</b> ((TODO REF) RateControlCfg.starting_buffer_level_ms)
-- <b>--buf-optimal-sz</b> ((TODO REF) RateControlCfg.optimal_buffer_level_ms)
+- <b>--buf-sz</b> (\ref RateControlCfg.maximum_buffer_size_ms)
+- <b>--buf-initial-sz</b> (\ref RateControlCfg.starting_buffer_level_ms)
+- <b>--buf-optimal-sz</b> (\ref RateControlCfg.optimal_buffer_level_ms)
 
 \subsection architecture_enc_vbr Variable Bitrate (VBR) Encoding