[FLINK-32767][doc] Fix en-doc SHOW CREATE TABLE usage

[GOODBOY008]

Fix en-doc SHOW CREATE TABLE usage.

[flinkbot]

CI report:

• ff9f636 Azure: SUCCESS

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[GOODBOY008]

@leonardBang Pls cc.

[RocMarshal]

Thanks @GOODBOY008 for your contribution.
I left a minor comment, PTAL ~

[RocMarshal]

Suggested change

	SHOW CREATE TABLE [catalog_name.][db_name.]table_name
	SHOW CREATE TABLE [[catalog_name.]db_name.]table_name

[GOODBOY008]

@RocMarshal [[catalog_name.]db_name.] is wrong semantics.

[leonardBang]

[[catalog_name.]db_name.]table_name is better one as [] means optional and flink sql supports full qualified table name like mycatalog.mydb.mytable and table with database prefix like mydb.mytable or even single table likemytable

[leonardBang]

flink/flink-table/flink-sql-client/src/test/resources/sql/catalog_database.q

Line 311 in 8c9b176

# test create with database name

[RocMarshal]

Thanks @GOODBOY008 for the update & @leonardBang review.
Maybe we need change the JIRA ticket title & the PR title to Fix table identifier format in docs or any-titles proper.
Because the rest of table identifier reference was updated.

[GOODBOY008]

@leonardBang @RocMarshal I found sqlserver offical doc use this. Although the explanation is very redundant, it is very clear.

[leonardBang]

@leonardBang @RocMarshal I found sqlserver offical doc use this. Although the explanation is very redundant, it is very clear.

+1, the sqlserver way is more friendly to users.

[GOODBOY008]

@leonardBang @RocMarshal In this pr, just modify show create table use [[catalog_name.]db_name.]table_name. Please code review.

[RocMarshal]

Thanks @GOODBOY008 for the update.
LGTM +1.
CC @leonardBang

[leonardBang]

Thanks @GOODBOY008 and @RocMarshal for the contribution, LGTM