[SPARK-33354][DOC] Remove an unnecessary quote in doc

### What changes were proposed in this pull request?

Remove an unnecessary quote in the documentation.
Super trivial.

### Why are the changes needed?

Fix a mistake.

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

No

### How was this patch tested?

Just doc

Closes apache#31523 from gengliangwang/removeQuote.

Authored-by: Gengliang Wang <gengliang.wang@databricks.com>
Signed-off-by: HyukjinKwon <gurwls223@apache.org>

docs/sql-ref-ansi-compliance.md

@@ -62,7 +62,7 @@ Spark SQL has three kinds of type conversions: explicit casting, type coercion,
 When `spark.sql.ansi.enabled` is set to `true`, explicit casting by `CAST` syntax throws a runtime exception for illegal cast patterns defined in the standard, e.g. casts from a string to an integer.
 On the other hand, `INSERT INTO` syntax throws an analysis exception when the ANSI mode enabled via `spark.sql.storeAssignmentPolicy=ANSI`.
 
-The type conversion of Spark ANSI mode follows the syntax rules of section 6.13 "cast specification" in [ISO/IEC 9075-2:2011 Information technology — Database languages - SQL — Part 2: Foundation (SQL/Foundation)"](https://www.iso.org/standard/53682.html), except it specially allows the following
+The type conversion of Spark ANSI mode follows the syntax rules of section 6.13 "cast specification" in [ISO/IEC 9075-2:2011 Information technology — Database languages - SQL — Part 2: Foundation (SQL/Foundation)](https://www.iso.org/standard/53682.html), except it specially allows the following
  straightforward type conversions which are disallowed as per the ANSI standard:
 * NumericType <=> BooleanType
 * StringType <=> BinaryType