libvpx: Pull from upstream

source/libvpx/usage.dox

Index: source/libvpx/usage.dox
diff --git a/source/libvpx/usage.dox b/source/libvpx/usage.dox
index 6bfca3bc80562d0f1e16d201493bccd3a92c699d..88235202d17fcbeaf216ec84d03b25b075467e46 100644
--- a/source/libvpx/usage.dox
+++ b/source/libvpx/usage.dox
@@ -12,13 +12,13 @@
     - \ref usage_init
     - \ref usage_errors
 
-    Fore more information on decoder and encoder specific usage, see the
+    For more information on decoder and encoder specific usage, see the
     following pages:
     \if decoder
-    - \subpage usage_decode
+    \li \subpage usage_decode
     \endif
-    \if decoder
-    - \subpage usage_encode
+    \if encoder
+    \li \subpage usage_encode
     \endif
 
     \section usage_types Important Data Types
@@ -81,12 +81,12 @@
 
     The available initialization methods are:
     \if encoder
-     - #vpx_codec_enc_init (calls vpx_codec_enc_init_ver())
-     - #vpx_codec_enc_init_multi (calls vpx_codec_enc_init_multi_ver())
-     .
+    \li #vpx_codec_enc_init (calls vpx_codec_enc_init_ver())
+    \li #vpx_codec_enc_init_multi (calls vpx_codec_enc_init_multi_ver())
+    \endif
+    \if decoder
+    \li #vpx_codec_dec_init (calls vpx_codec_dec_init_ver())
     \endif
-    \if decoder - #vpx_codec_dec_init (calls vpx_codec_dec_init_ver()) \endif
-
 
 
     \section usage_errors Error Handling