[SPARK-28798][FOLLOW-UP] Add alter view link to drop view

### What changes were proposed in this pull request?
Add alter view link to drop view

### Why are the changes needed?
create view has links to drop view and alter view
alter view has  links to create view and drop view
drop view currently doesn't have a link to alter view. I think it's better to link to alter view as well.

### Does this PR introduce any user-facing change?
Yes

### How was this patch tested?
Tested using jykyll build --serve

Closes apache#26495 from huaxingao/spark-28798.

Authored-by: Huaxin Gao <[email protected]>
Signed-off-by: Sean Owen <[email protected]>

Author: huaxingao

docs/sql-ref-syntax-ddl-drop-view.md

@@ -77,5 +77,6 @@ DROP VIEW IF EXISTS employeeView;
 
 ### Related Statements
 - [CREATE VIEW](sql-ref-syntax-ddl-create-view.html)
+- [ALTER VIEW](sql-ref-syntax-ddl-alter-view.html)
 - [CREATE DATABASE](sql-ref-syntax-ddl-create-database.html)
 - [DROP DATABASE](sql-ref-syntax-ddl-drop-database.html)