Document CREATE EXTERNAL TABLE ... OPTIONS

[alamb]

Is your feature request related to a problem or challenge?

While reviewing https://github.com/apache/datafusion/pull/10404/files I could not find documentation on what the syntax / available settings are for the OPTIONS clause

For example there are generic options like

CREATE EXTERNAL TABLE 
....
  OPTIONS(
    NULL_VALUE 'NAN',
  )

And then there are format specific options like (the newly added):

CREATE EXTERNAL TABLE 
....
  OPTIONS(
    NULL_VALUE 'NAN',
    'format.has_header' 'true'
  )

Neither appears to be documented

Describe the solution you'd like

It would be great (as another PR) if we can document them similarly to how @devinjdangelo documented the write options:

https://datafusion.apache.org/user-guide/sql/write_options.html#available-options

With a section for the generic options that apply to all formats and then a list of options for each specific format

Describe alternatives you've considered

No response

Additional context

No response