aom_ext_ratectrl.h,cosmetics: fix some typos

Change-Id: I563342afc5acec481bbdc94feede347c43fb5756

aom/aom_ext_ratectrl.h

diff --git a/aom/aom_ext_ratectrl.h b/aom/aom_ext_ratectrl.h
index 46c8f20..7059693 100644
--- a/aom/aom_ext_ratectrl.h
+++ b/aom/aom_ext_ratectrl.h
@@ -144,7 +144,7 @@
 #define AOM_DEFAULT_RDMULT -1
 
 /*!\brief Superblock quantization parameters
- * Store the superblock quantiztaion parameters
+ * Store the superblock quantization parameters
  */
 typedef struct aom_sb_parameters {
   int q_index; /**< Quantizer step index [0..255]*/
@@ -240,7 +240,7 @@
   /*!
    * Weight assigned to this frame (or total weight for the collection of
    * frames) currently based on intra factor and brightness factor. This is used
-   * to distribute bits betweeen easier and harder frames.
+   * to distribute bits between easier and harder frames.
    */
   double weight;
   /*!