[SPARK-30363][SQL][DOC] Add Documentation for refresh resources

### What changes were proposed in this pull request?
Documentation added for refresh resources command in spark-sql.

### Why are the changes needed?
Previously, only refresh table command was documented.

### Does this PR introduce any user-facing change?
Yes. Now users can access documentation for refresh resources command.

### How was this patch tested?
Manually.

Closes #27023 from iRakson/SPARK-30363.

Authored-by: root1 <[email protected]>
Signed-off-by: Sean Owen <[email protected]>

Author: iRakson

docs/_data/menu-sql.yaml

@@ -172,6 +172,8 @@
                   url: sql-ref-syntax-aux-cache-clear-cache.html
                 - text: REFRESH TABLE
                   url: sql-ref-syntax-aux-refresh-table.html
+                - text: REFRESH
+                  url: sql-ref-syntax-aux-cache-refresh.md
             - text: Describe Commands
               url: sql-ref-syntax-aux-describe.html
               subitems:

docs/sql-ref-syntax-aux-cache-refresh.md

@@ -0,0 +1,54 @@
+---
+layout: global
+title: REFRESH
+displayTitle: REFRESH
+license: |
+  Licensed to the Apache Software Foundation (ASF) under one or more
+  contributor license agreements.  See the NOTICE file distributed with
+  this work for additional information regarding copyright ownership.
+  The ASF licenses this file to You under the Apache License, Version 2.0
+  (the "License"); you may not use this file except in compliance with
+  the License.  You may obtain a copy of the License at
+ 
+     http://www.apache.org/licenses/LICENSE-2.0
+ 
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+---
+
+### Description
+`REFRESH` is used to invalidate and refresh all the cached data (and the associated metadata) for
+all Datasets that contains the given data source path. Path matching is by prefix, i.e. "/" would
+invalidate everything that is cached. 
+
+### Syntax
+{% highlight sql %}
+REFRESH resource_path
+{% endhighlight %}
+
+### Parameters
+<dl>
+ <dt><code><em>resource_path</em></code></dt>
+ <dd>The path of the resource that is to be refreshed.</dd>
+</dl>
+
+### Examples
+{% highlight sql %}
+ -- The Path is resolved using the datasource's File Index.
+ 
+CREATE TABLE test(ID INT) using parquet;
+INSERT INTO test SELECT 1000;
+CACHE TABLE test;
+INSERT INTO test SELECT 100;
+REFRESH "hdfs://path/to/table";
+ 
+{% endhighlight %}
+
+### Related Statements
+- [CACHE TABLE](sql-ref-syntax-aux-cache-cache-table.html)
+- [CLEAR CACHE](sql-ref-syntax-aux-cache-clear-cache.html)
+- [UNCACHE TABLE](sql-ref-syntax-aux-cache-uncache-table.html)
+- [REFRESH TABLE](sql-ref-syntax-aux-refresh-table.html)