doc update request

[ghost]

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Make sure you are using the latest version: run youtube-dl --version and ensure your version is 2016.06.03. If it's not read this FAQ entry and update. Issues with outdated version will be rejected.

• [x ] I've verified and I assure that I'm running youtube-dl 2016.06.03

Before submitting an issue make sure you have:

• [x ] At least skimmed through README and most notably FAQ and BUGS sections
• Searched the bugtracker for similar issues including closed ones

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• Bug report (encountered problems with youtube-dl)
• Site support request (request for adding support for a new site)
• Feature request (request for a new functionality)
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• [x ] Other

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Passing youtube-dl variables from Windows command prompt requires double %.
eg %(title)s must be %%(title)s

DOS strips first % it receives as a variable before youtube-dl receives it.
eg%(title)s becomes (title)s to youtube-dl, which is not a variable.

Docs mention this vaguely. Please clarify.
"To specify percent literal in output template use %%."

[dstftw]

Passing arguments from command prompt does not require doubling %. The only place where it should be doubled is a batch file.

To specify percent literal in output template use %%

This is unrelated at all.