Fixed 'to to' to 'to'

[exapsy]

Too many to's in this commit.

[googlebot]

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[exapsy]

I signed it!

[googlebot]

CLAs look good, thanks!

ℹ️ Googlers: Go here for more info.

[malcolmr]

This file is generated by running https://github.com/google/vimdoc over the source, e.g. from https://github.com/google/vim-codefmt/blob/ddc5b8/instant/flags.vim#L98. Could you fix the source and regenerate this file?

[exapsy]

Yes, I could do it.

[dbarnett]

Thanks!