Editorial: fix extra "the" in controller.error()

[MattiasBuelens]

As it says on the tin. 😁

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[MattiasBuelens]

Hmm, looks like the build failed for something unrelated to this PR:

 Error running preprocessor, returned code: 2.
LINK ERROR: No 'idl' refs found for 'MessagePort'.
{{MessagePort}}
make: *** [Makefile:23: deploy] Error 22
 ✘  Did not generate, due to fatal errors
##[error]Process completed with exit code 2.

Did something change in the MessagePort IDL definition?

[ricea]

lgtm. I will try to track down the cause of the Bikeshed error.

[domenic]

We're having strange IDL linking errors across the WHATWG spec ecosystem at the moment... speced/bikeshed#1753

[ricea]

I think if I merge it now it will produce bad output, so I will wait until the IDL linking errors are fixed.

[plinss]

There was a change to the triggers for Shepherd's IDL detection that broke the HTML spec, reverted. The DB should be updated in a few minutes.