Fix obvious mistakes like spelling errors

src/main/java/com/alibaba/druid/sql/dialect/sqlserver/ast/SQLServerColumnDefinition.java

@@ -49,7 +49,7 @@ public class SQLServerColumnDefinition extends SQLColumnDefinition implements SQ
             this.acceptChild(visitor, name);
             this.acceptChild(visitor, dataType);
             this.acceptChild(visitor, defaultExpr);
-            this.acceptChild(visitor, constaints);
+            this.acceptChild(visitor, constraints);
             this.acceptChild(visitor, identity);
         }
         visitor.endVisit(this);

src/main/java/com/alibaba/druid/sql/dialect/sqlserver/ast/expr/SQLServerObjectReferenceExpr.java

@@ -45,7 +45,7 @@ public class SQLServerObjectReferenceExpr extends SQLServerObjectImpl implements
         }
     }
 
-    public String getSimleName() {
+    public String getSimpleName() {
         if (schema != null) {
             return schema;
         }

src/main/java/com/alibaba/druid/sql/dialect/sqlserver/visitor/SQLServerOutputVisitor.java

@@ -267,7 +267,7 @@ public class SQLServerOutputVisitor extends SQLASTOutputVisitor implements SQLSe
             visitColumnDefault(x);
         }
 
-        for (SQLColumnConstraint item : x.getConstaints()) {
+        for (SQLColumnConstraint item : x.getConstraints()) {
             print(' ');
             item.accept(this);
         }