Script Code Snippets; added snippet to update a Bookmark to include an Electronic Signature block suitable for Secured Signing

An additional code snippet has been added to update a Bookmark to include an Electronic Signature block suitable for Secured Signing.

The new snippet is found under the "Document' folder and is labelled "Bookmarks Electronic Signature Block (Secured Signing)".

This can be used as the basis for customising the Secured Signing "Smart Tag" used, for example to only include initials.