[ES|QL] Cleanup FROM OPTIONS from documentation (#183586)

## Summary

We decided to remove the FROM OPTIONS from ES|QL support
elastic/elasticsearch#108700. This PR:

- removes it from the inline docs
- removes it from the ai assistant docs

packages/kbn-text-based-editor/src/esql_documentation_sections.tsx

@@ -106,16 +106,6 @@ Also, similar to the index fields, once an aggregation is performed, a metadata
 FROM employees [METADATA _index, _id]
 | STATS max = MAX(emp_no) BY _index
 \`\`\`
-
-The \`OPTIONS\` directive of the FROM command allows you to configure the way ES|QL accesses the data to be queried. The argument passed to this directive is a comma-separated list of option name-value pairs, with the option name and the corresponding value double-quoted.
-
-For example:
-
-\`\`\`
-FROM index_pattern [OPTIONS "option1"="value1"[,...[,"optionN"="valueN"]]]
-\`\`\`
-
-Learn more about the \`OPTIONS\` directive in the [main documentation page](https://www.elastic.co/guide/en/elasticsearch/reference/master/esql-index-options.html#esql-index-options).
             `,
               description:
                 'Text is in markdown. Do not translate function names, special characters, or field names like sum(bytes)',

x-pack/plugins/observability_solution/observability_ai_assistant_app/server/functions/query/esql_docs/esql-from.txt

@@ -2,17 +2,14 @@ FROM
 
 Syntax
 ```esql
-FROM index_pattern [METADATA fields] [OPTIONS options]
+FROM index_pattern [METADATA fields]
 ```
 
 Parameters
 index_pattern
 A list of indices, data streams or aliases. Supports wildcards and date math.
 fields
 A comma-separated list of metadata fields to retrieve.
-options
-A comma-separated list of index options to configure
-data access.
 DescriptionThe
 ```esql
 FROM source command returns a table with data from a data stream, index,
@@ -64,9 +61,3 @@ See using ES|QL across clusters.Use the optional METADATA directive to enable me
 ```esql
 FROM employees METADATA _id
 ```
-
-Use the optional OPTIONS directive to specify index access options.
-This directive must follow METADATA, if both are specified:
-```esql
-FROM employees* METADATA _index OPTIONS "ignore_unavailable"="true"
-```