documentation: minor cosmetics

- correct spelling
- remove explicit file name w/\file (unnecessary when contained in the
  same file and prone to desync)

Change-Id: I68a3960ac5ab84d0f2e5c9b2e29799f26dfccf23
diff --git a/vpx/src/vpx_decoder.c b/vpx/src/vpx_decoder.c
index 7b78e5c..fe6ea75 100644
--- a/vpx/src/vpx_decoder.c
+++ b/vpx/src/vpx_decoder.c
@@ -9,7 +9,7 @@
  */
 
 
-/*!\file vpx_decoder.c
+/*!\file
  * \brief Provides the high level interface to wrap decoder algorithms.
  *
  */