fix comments

Author: angelamayxie

sql/analyzer/apply_foreign_keys.go

@@ -449,7 +449,7 @@ func getForeignKeyRefActions(ctx *sql.Context, a *Analyzer, tbl sql.ForeignKeyTa
 }
 
 // getForeignKeyHandlerFromUpdateTarget creates a ForeignKeyHandler from a given update target Node. It is used for
-// applying foreign key constrains to Update nodes
+// applying foreign key constraints to Update nodes
 func getForeignKeyHandlerFromUpdateTarget(updateTarget sql.Node, ctx *sql.Context, a *Analyzer,
 	cache *foreignKeyCache, fkChain foreignKeyChain) (*plan.ForeignKeyHandler, error) {
 	updateDest, err := plan.GetUpdatable(updateTarget)

sql/analyzer/assign_update_join.go

@@ -52,7 +52,7 @@ func modifyUpdateExprsForJoin(ctx *sql.Context, a *Analyzer, n sql.Node, scope *
 	return n, transform.SameTree, nil
 }
 
-// getUpdateTargetsByTable maps a set of table names to their corresponding update target Node
+// getUpdateTargetsByTable maps a set of table names and aliases to their corresponding update target Node
 func getUpdateTargetsByTable(node sql.Node, ij sql.Node) (map[string]sql.Node, error) {
 	namesOfTableToBeUpdated := getTablesToBeUpdated(node)
 	resolvedTables := getTablesByName(ij)