[changeset] don't remove whitespace within @example in docstrings

[Thorsten Meyer]

Hi,

during the build process of octave, the documentation strings within the .m files are extracted by
the script scripts/mkdoc. This scripts also removes white space before @-commands at the beginning
of lines. The script also removes white space before @result{}, which distorts the display of the
@examples in the documentations strings.

Included, you will find a changeset that fixes mkdoc, such that it no longer eats white space
within @example environments.

regards

Thorsten