[SPARK-46576][SQL][FOLLOWUP] Improve error messages for unsupported d…

…ata source save mode

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

This PR is a follow up for apache#44576 to change the single quotes to double quotes for data source name.

### Why are the changes needed?

To make the error message format consistent.

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

No

### How was this patch tested?

Existing tests

### Was this patch authored or co-authored using generative AI tooling?

No

Closes apache#44790 from allisonwang-db/spark-46576-follow-up.

Authored-by: allisonwang-db <allison.wang@databricks.com>
Signed-off-by: Hyukjin Kwon <gurwls223@apache.org>

common/utils/src/main/resources/error/error-classes.json

@@ -3619,7 +3619,7 @@
   },
   "UNSUPPORTED_DATA_SOURCE_SAVE_MODE" : {
     "message" : [
-      "The data source '<source>' cannot be written in the <createMode> mode. Please use either the \"Append\" or \"Overwrite\" mode instead."
+      "The data source \"<source>\" cannot be written in the <createMode> mode. Please use either the \"Append\" or \"Overwrite\" mode instead."
     ],
     "sqlState" : "0A000"
   },

docs/sql-error-conditions.md

@@ -2360,7 +2360,7 @@ Unsupported data type `<typeName>`.
 
 [SQLSTATE: 0A000](sql-error-conditions-sqlstates.html#class-0A-feature-not-supported)
 
-The data source '`<source>`' cannot be written in the `<createMode>` mode. Please use either the "Append" or "Overwrite" mode instead.
+The data source "`<source>`" cannot be written in the `<createMode>` mode. Please use either the "Append" or "Overwrite" mode instead.
 
 ### UNSUPPORTED_DATA_TYPE_FOR_DATASOURCE