[SPARK-32193][SQL][DOCS] Update regexp usage in SQL docs

### What changes were proposed in this pull request?
update REGEXP usage and examples in sql-ref-syntx-qry-select-like.cmd

### Why are the changes needed?
make the usage of REGEXP known to more users

### Does this PR introduce _any_ user-facing change?

No

### How was this patch tested?

No tests

Closes #29009 from GuoPhilipse/update-migrate-guide.

Lead-authored-by: GuoPhilipse <[email protected]>
Co-authored-by: GuoPhilipse <[email protected]>
Signed-off-by: Takeshi Yamamuro <[email protected]>
(cherry picked from commit 09cc6c5)
Signed-off-by: Takeshi Yamamuro <[email protected]>

Author: GuoPhilipse

docs/sql-ref-syntax-qry-select-like.md

@@ -26,7 +26,7 @@ A LIKE predicate is used to search for a specific pattern.
 ### Syntax
 
 ```sql
-[ NOT ] { LIKE search_pattern [ ESCAPE esc_char ] | RLIKE regex_pattern }
+[ NOT ] { LIKE search_pattern [ ESCAPE esc_char ] | [ RLIKE | REGEXP ] regex_pattern }
 ```
 
 ### Parameters
@@ -44,7 +44,7 @@ A LIKE predicate is used to search for a specific pattern.
 
 * **regex_pattern**
 
-    Specifies a regular expression search pattern to be searched by the `RLIKE` clause.
+    Specifies a regular expression search pattern to be searched by the `RLIKE` or `REGEXP` clause.
 
 ### Examples
 
@@ -90,6 +90,14 @@ SELECT * FROM person WHERE name RLIKE 'M+';
 |200|Mary|null|
 +---+----+----+
 
+SELECT * FROM person WHERE name REGEXP 'M+';
++---+----+----+
+| id|name| age|
++---+----+----+
+|300|Mike|  80|
+|200|Mary|null|
++---+----+----+
+
 SELECT * FROM person WHERE name LIKE '%\_%';
 +---+------+---+
 | id|  name|age|