docs: Add CREATE/DROP TABLE docs to sql/explain.rst

[HeidiHan0000]

Summary: as title.

Differential Revision: D93814964

Summary by Sourcery

Document CREATE TABLE and DROP TABLE usage in the SQL EXPLAIN reference.

Documentation:

• Add EXPLAIN documentation coverage for CREATE TABLE statements.
• Add EXPLAIN documentation coverage for DROP TABLE statements.

== NO RELEASE NOTE ==

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Updates the SQL EXPLAIN documentation to cover CREATE TABLE and DROP TABLE statements within presto-docs/src/main/sphinx/sql/explain.rst.

File-Level Changes

Change	Details	Files
Extend EXPLAIN docs to include CREATE TABLE and DROP TABLE coverage.	Add or update EXPLAIN syntax/usage sections to describe how EXPLAIN applies to CREATE TABLE statements Add or update EXPLAIN syntax/usage sections to describe how EXPLAIN applies to DROP TABLE statements Adjust surrounding narrative examples or formatting in the EXPLAIN page to integrate the new statements consistently	presto-docs/src/main/sphinx/sql/explain.rst

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[sourcery-ai]

Hey - I've reviewed your changes and they look great!

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[steveburnett]

Thank you for the documentation! The examples are great. One nit of phrasing, nothing else noticed.

[HeidiHan0000]

@steveburnett Thanks! Updated

[steveburnett]

LGTM! (docs)

Pull updated branch, new local doc build, looks good. Thanks!