Minor comments.

sql/sql_lex.h:
  Minor fix of a comment.
sql/table.h:
  Minor fix of a comment.

sql/sql_lex.h

@@ -804,7 +804,7 @@ typedef struct st_lex
   /*
     A flag that indicates what kinds of derived tables are present in the
     query (0 if no derived tables, otherwise a combination of flags
-    DERIVED_SUBQUERY and DERIVED_VIEW.
+    DERIVED_SUBQUERY and DERIVED_VIEW).
   */
   uint8 derived_tables;
   uint8 create_view_algorithm;

sql/table.h

@@ -550,13 +550,13 @@ typedef struct st_table_list
   */
   st_table_list	*referencing_view;
   /*
-    security  context (non-zero only for tables which belong
-    to view with SQL SEQURITY DEFINER)
+    Security  context (non-zero only for tables which belong
+    to view with SQL SECURITY DEFINER)
   */
   Security_context *security_ctx;
   /*
-    this view security context (non-zero only for views with
-    SQL SEQURITY DEFINER)
+    This view security context (non-zero only for views with
+    SQL SECURITY DEFINER)
   */
   Security_context *view_sctx;
   /*