[SPARK-33354][FOLLOWUP][DOC] Shorten the table width of ANSI complian…

…ce casting document

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

This is a follow-up of apache#30260
It shortens the table width of ANSI compliance casting document.

### Why are the changes needed?

The table is too wide and the UI of doc site is broken if we scroll the page to right side.
![Screen Shot 2021-01-14 at 3 04 57 PM](https://user-images.githubusercontent.com/1097932/104565897-d2693b80-5601-11eb-9f93-5f603cfc94c1.png)

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

Minor document change

### How was this patch tested?

Build doc site locally and preview:
![Screen Shot 2021-01-14 at 4 44 30 PM](https://user-images.githubusercontent.com/1097932/104565814-b2d21300-5601-11eb-94c4-78c785cda8ed.png)

Closes apache#31180 from gengliangwang/reviseAnsiDocStyle.

Authored-by: Gengliang Wang <gengliang.wang@databricks.com>
Signed-off-by: Dongjoon Hyun <dhyun@apple.com>

docs/sql-ref-ansi-compliance.md

@@ -85,23 +85,16 @@ The type conversion of Spark ANSI mode follows the syntax rules of section 6.13
 
 | Source\Target | Numeric | String | Date | Timestamp | Interval | Boolean | Binary | Array | Map | Struct |
 |-----------|---------|--------|------|-----------|----------|---------|--------|-------|-----|--------|
-| Numeric   | <span style="color:red">**Y**</span> | Y      | N    | N         | N        | Y       | N      | N     | N   | N      |
-| String    | <span style="color:red">**Y**</span> | Y | <span style="color:red">**Y**</span> | <span style="color:red">**Y**</span> | <span style="color:red">**Y**</span> | <span style="color:red">**Y**</span> | Y | N     | N   | N      |
+| Numeric   | Y       | Y      | N    | N         | N        | Y       | N      | N     | N   | N      |
+| String    | Y       | Y      | Y    | Y         | Y        | Y       | Y      | N     | N   | N      |
 | Date      | N       | Y      | Y    | Y         | N        | N       | N      | N     | N   | N      |
 | Timestamp | N       | Y      | Y    | Y         | N        | N       | N      | N     | N   | N      |
 | Interval  | N       | Y      | N    | N         | Y        | N       | N      | N     | N   | N      |
 | Boolean   | Y       | Y      | N    | N         | N        | Y       | N      | N     | N   | N      |
-| Binary    | N       | Y      | N    | N         | N        | N       | Y      | N     | N   | N      |
-| Array     | N       | Y      | N    | N         | N        | N       | N      | <span style="color:red">**Y**</span> | N   | N      |
-| Map       | N       | Y      | N    | N         | N        | N       | N      | N     | <span style="color:red">**Y**</span> | N      |
-| Struct    | N       | Y      | N    | N         | N        | N       | N      | N     | N   | <span style="color:red">**Y**</span> |
-
-In the table above, all the `CAST`s that can cause runtime exceptions are marked as red <span style="color:red">**Y**</span>:
-* CAST(Numeric AS Numeric): raise an overflow exception if the value is out of the target data type's range.
-* CAST(String AS (Numeric/Date/Timestamp/Interval/Boolean)): raise a runtime exception if the value can't be parsed as the target data type.
-* CAST(Array AS Array): raise an exception if there is any on the conversion of the elements.
-* CAST(Map AS Map): raise an exception if there is any on the conversion of the keys and the values.
-* CAST(Struct AS Struct): raise an exception if there is any on the conversion of the struct fields.
+| Binary    | Y       | N      | N    | N         | N        | N       | Y      | N     | N   | N      |
+| Array     | N       | N      | N    | N         | N        | N       | N      | Y     | N   | N      |
+| Map       | N       | N      | N    | N         | N        | N       | N      | N     | Y   | N      |
+| Struct    | N       | N      | N    | N         | N        | N       | N      | N     | N   | Y      |
 
 Currently, the ANSI mode affects explicit casting and assignment casting only.
 In future releases, the behaviour of type coercion might change along with the other two type conversion rules.