[8.18] [ES|QL] Removes SHOW functions from docs (elastic#220652) (elastic#220673)

# Backport

This will backport the following commits from `main` to `8.18`:
- [[ES|QL] Removes SHOW functions from docs
(elastic#220652)](elastic#220652)

<!--- Backport version: 9.6.6 -->

### Questions ?
Please refer to the [Backport tool
documentation](https://github.com/sorenlouv/backport)

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BACKPORT-->

Co-authored-by: Stratoula Kalafateli <[email protected]>

Author: kibanamachine

src/platform/packages/private/kbn-language-documentation/src/sections/esql_documentation_sections.tsx

@@ -145,10 +145,7 @@ ROW a = ROUND(1.23, 0)
         <Markdown
           markdownContent={i18n.translate('languageDocumentation.documentationESQL.show.markdown', {
             defaultMessage: `### SHOW
-The \`SHOW <item>\` source command returns information about the deployment and its capabilities:
-
-* Use \`SHOW INFO\` to return the deployment's version, build date and hash.
-* Use \`SHOW FUNCTIONS\` to return a list of all supported functions and a synopsis of each function.
+The \`SHOW INFO\` source command returns the deployment's version, build date and hash.
             `,
             ignoreTag: true,
             description: