Fix typos in C comments inside sql/

sql/sql_class.h

@@ -1162,7 +1162,7 @@ public:
     Iterates registered threads.
 
     @param action      called for every element
-    @param argument    opque argument passed to action
+    @param argument    opaque argument passed to action
 
     @return
       @retval 0 iteration completed successfully
@@ -1226,7 +1226,7 @@ public:
   bool is_reprepared;
 #endif
   /*
-    The states relfects three diffrent life cycles for three
+    The state reflects three different life cycles for three
     different types of statements:
     Prepared statement: STMT_INITIALIZED -> STMT_PREPARED -> STMT_EXECUTED.
     Stored procedure:   STMT_INITIALIZED_FOR_SP -> STMT_EXECUTED.
@@ -2225,7 +2225,7 @@ public:
     - mask a warning/error and throw another one instead.
     When this method returns true, the sql condition is considered
     'handled', and will not be propagated to upper layers.
-    It is the responsability of the code installing an internal handler
+    It is the responsibility of the code installing an internal handler
     to then check for trapped conditions, and implement logic to recover
     from the anticipated conditions trapped during runtime.
 
@@ -3197,7 +3197,7 @@ public:
     chapter 'Miscellaneous functions', for functions GET_LOCK, RELEASE_LOCK.
   */
   HASH ull_hash;
-  /* Hash of used seqeunces (for PREVIOUS value) */
+  /* Hash of used sequences (for PREVIOUS value) */
   HASH sequences;
 #ifdef DBUG_ASSERT_EXISTS
   uint dbug_sentry; // watch out for memory corruption
@@ -3991,7 +3991,7 @@ public:
 
   /*
     If this is a slave, the name of the connection stored here.
-    This is used for taging error messages in the log files.
+    This is used for tagging error messages in the log files.
   */
   LEX_CSTRING connection_name;
   uint8      password; /* 0, 1 or 2 */
@@ -5461,7 +5461,7 @@ public:
     locked_tables_mode= mode_arg;
   }
   void leave_locked_tables_mode();
-  /* Relesae transactional locks if there are no active transactions */
+  /* Release transactional locks if there are no active transactions */
   void release_transactional_locks()
   {
     if (!in_active_multi_stmt_transaction())
@@ -6262,7 +6262,7 @@ class select_result_interceptor;
 /*
   Interface for sending tabular data, together with some other stuff:
 
-  - Primary purpose seems to be seding typed tabular data:
+  - Primary purpose seems to be sending typed tabular data:
      = the DDL is sent with send_fields()
      = the rows are sent with send_data()
   Besides that,
@@ -6414,7 +6414,7 @@ private:
 
 
 /*
-  Base class for select_result descendands which intercept and
+  Base class for select_result descendants which intercept and
   transform result set rows. As the rows are not sent to the client,
   sending of result set metadata should be suppressed as well.
 */
@@ -6724,7 +6724,7 @@ public:
   void abort_result_set() override;
   bool can_rollback_data() override { return 1; }
 
-  // Needed for access from local class MY_HOOKS in prepare(), since thd is proteted.
+  // Needed for access from local class MY_HOOKS in prepare(), since thd is protected.
   const THD *get_thd(void) { return thd; }
   const HA_CREATE_INFO *get_create_info() { return create_info; };
   int prepare2(JOIN *join) override { return 0; }
@@ -7114,7 +7114,7 @@ class select_union_recursive :public select_unit
 
   Function calls are forwarded to the wrapped select_result, but some
   functions are expected to be called only once for each query, so
-  they are only executed for the first SELECT in the union (execept
+  they are only executed for the first SELECT in the union (except
   for send_eof(), which is executed only for the last SELECT).
 
   This select_result is used when a UNION is not DISTINCT and doesn't
@@ -7230,7 +7230,7 @@ public:
 
 /*
   This class specializes select_union to collect statistics about the
-  data stored in the temp table. Currently the class collects statistcs
+  data stored in the temp table. Currently the class collects statistics
   about NULLs.
 */
 
@@ -7257,9 +7257,9 @@ protected:
   */
   uint max_nulls_in_row;
   /*
-    Count of rows writtent to the temp table. This is redundant as it is
+    Count of rows written to the temp table. This is redundant as it is
     already stored in handler::stats.records, however that one is relatively
-    expensive to compute (given we need that for evry row).
+    expensive to compute (given we need that for every row).
   */
   ha_rows count_rows;