Remove docs for deprecated compat version methods.
De-version Pathname.
De-version Socket
De-version StringIO
De-version StringScanner
De-version Dir
De-version File
De-version Math
De-version Process
Finish de-versioning Regexp
Remove comments for deprecated compat version methods.
De-version RbConfig
De-version Socket, BasicSocket, and IPSocket
De-version StringIO
De-version StringScanner
De-version Tempfile
De-version thread library
De-version zlib library
De-version Map proxy
De-version some miscellany