Fix typo

lib/includes/nghttp2/nghttp2.h

@@ -422,7 +422,7 @@ typedef enum {
 /**
  * @struct
  *
- * The object representing single contagious buffer.
+ * The object representing single contiguous buffer.
  */
 typedef struct {
   /**

lib/nghttp2_buf.h

@@ -312,8 +312,8 @@ int nghttp2_bufs_orb_hold(nghttp2_bufs *bufs, uint8_t b);
   } while (0)
 
 /*
- * Copies all data stored in |bufs| to the contagious buffer.  This
- * function allocates the contagious memory to store all data in
+ * Copies all data stored in |bufs| to the contiguous buffer.  This
+ * function allocates the contiguous memory to store all data in
  * |bufs| and assigns it to |*out|.
  *
  * The contents of |bufs| is left unchanged.