[SPARK-29901][SQL][DOC] Fix broken links in SQL Reference

### What changes were proposed in this pull request?
Fix broken links

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

Closes apache#26528 from huaxingao/spark-29901.

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

Author: huaxingao

docs/sql-ref-syntax-aux-show-databases.md

@@ -74,6 +74,6 @@ SHOW SCHEMAS;
   +------------+
 {% endhighlight %}
 ### Related Statements
-- [DESCRIBE DATABASE](sql-ref-syntax-aux-describe-databases.html)
+- [DESCRIBE DATABASE](sql-ref-syntax-aux-describe-database.html)
 - [CREATE DATABASE](sql-ref-syntax-ddl-create-database.html)
 - [ALTER DATABASE](sql-ref-syntax-ddl-alter-database.html)

docs/sql-ref-syntax-aux-show-tblproperties.md

@@ -111,4 +111,5 @@ SHOW TBLPROPERTIES customer ('created.date');
 ### Related Statements
 - [CREATE TABLE](sql-ref-syntax-ddl-create-table.html)
 - [ALTER TABLE SET TBLPROPERTIES](sql-ref-syntax-ddl-alter-table.html)
-- [SHOW TABLE](sql-ref-syntax-aux-show-table.html)
+- [SHOW TABLES](sql-ref-syntax-aux-show-tables.html)
+- [SHOW TABLE EXTENDED](sql-ref-syntax-aux-show-table.html)

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

@@ -58,7 +58,7 @@ CREATE [OR REPLACE] [[GLOBAL] TEMPORARY] VIEW [IF NOT EXISTS] [db_name.]view_nam
 </dl>
 <dl>
   <dt><code><em>query</em></code></dt>
-  <dd>A <a href="sql-ref-syntax-qry-select.md">SELECT</a> statement that constructs the view from base tables or other views.</dd>
+  <dd>A <a href="sql-ref-syntax-qry-select.html">SELECT</a> statement that constructs the view from base tables or other views.</dd>
 </dl>
 
 ### Examples

docs/sql-ref-syntax-ddl-truncate-table.md

@@ -82,5 +82,5 @@ No rows selected
 
 ### Related Statements
 - [DROP TABLE](sql-ref-syntax-ddl-drop-table.html)
-- [ALTER TABLE](sql-ref-syntax-ddl-alter-tabley.html)
+- [ALTER TABLE](sql-ref-syntax-ddl-alter-table.html)