Add missing parameter name for algorithm

[TimvdLippe]

It currently lists all parameters explicitly, except for input. While implementing this algorithm in Servo, I was confused what the value of input is supposed to be. Then I saw that it is probably the third argument, so let's make that explicit.

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[TimvdLippe]

I have linked my GitHub acccount to a W3C account

[TimvdLippe]

@fred-wang do you mind restarting this build? Seems like a tiny fix

[fred-wang]

@TimvdLippe mmh, I don't know how I can do that (maybe @lukewarlow knows?). Shouldn't a forced push do that automatically?

[TimvdLippe]

I made this change via the GitHub UI and don't have a local copy available that I can run git commands on :/ I could recreate the PR?

[fred-wang]

Sorry I don't think I can relaunch the ipr check

[lukewarlow]

I'm going to go ahead and mark this as non substantative because that's what it is

[w3cbot]

lukewarlow marked as non substantive for IPR from ash-nazg.

[TimvdLippe]

Cool thanks for figuring it out!