Updated trouble shooting doc for "watchman taking too long to load" error

[linshu123]

Added another workaround - initiate a source control repository

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[linshu123]

Someone has documented this workaround: #2042. I believe it should be on the trouble shooting page.

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[andismith]

Please can this be merged in to the troubleshooting doc as it's caused my team some headaches, which would have taken less time to figure out had this been included.

[javache]

@wez: can you confirm that this is a legitimate workaround? Is @frantic's 1e1efce a sufficient fix?

[wez]

@frantic's fix should be sufficient. It is true that having source control initiated will also resolve this, but the presence of a .watchmanconfig file is the definitive signal to watchman on locating the root of the repo.