DOCSP-15489 update mongo shell banner for mongosh

[ghost]

There are a large number of files in this change set. Most of them have only superficial changes. Here is a short summary of the changes made:

The substantive changes are found in the following files:
source/includes/fact-mongosh-shell-method.rst
source/includes/fact-mongosh-shell-method-toc.rst

Two index pages had updates:
source/reference/method/js-collection.txt
source/reference/method/js-cursor.txt

One method was only partially migrated to mongosh
source/reference/method/db.getMongo.txt

There was a small, title change in:
source/reference/method.txt

The remaining files in the change set were updated to reflect filenames for the include files.
source/includes/fact-mongo-shell-method.rst was renamed:
source/includes/fact-mongosh-shell-method.rst

source/includes/fact-mongo-shell-method-toc.rst was renamed:
source/includes/fact-mongosh-shell-method-toc.rst

STAGING LINKS

This is a sample page using the updated banner

https://docs-mongodbcom-staging.corp.mongodb.com/docs/docsworker-xlarge/DOCSP-15489-update-mongo-shell-banner-for-mongosh-v5.0/reference/method/db.collection.distinct/

These pages use the updated index files:

https://docs-mongodbcom-staging.corp.mongodb.com/docs/docsworker-xlarge/DOCSP-15489-update-mongo-shell-banner-for-mongosh-v5.0/reference/method/js-cursor/
https://docs-mongodbcom-staging.corp.mongodb.com/docs/docsworker-xlarge/DOCSP-15489-update-mongo-shell-banner-for-mongosh-v5.0/reference/method/js-collection/

This page references a method which was not ported to mongosh

https://docs-mongodbcom-staging.corp.mongodb.com/docs/docsworker-xlarge/DOCSP-15489-update-mongo-shell-banner-for-mongosh-v5.0/reference/method/db.getMongo/

JIRA TICKET LINK

https://jira.mongodb.org/browse/DOCSP-15489

[ghost]

NB: This link is not yet live so it doesn't appear on the staging page. The link will be updated before the docs are released.

[ghost]

NB: This link is not yet live so it doesn't appear on the staging page. The link will be updated before the docs are released.

[mmarcon]

There is a difference in Cursor.map() between mongo and mongosh. In mongo, that method returns an array. However, in mongosh that method returns the Cursor object again. If you need the array you have to call cursor.map().toArray().

[ghost]

@mmarcon Created https://jira.mongodb.org/browse/DOCSP-15895 for the cursor.map() update

[jeff-allen-mongo]

This bulleted list should not be indented like this. It will show an "unexpected indentation" error in the build log.