a typo in beagle-build-index's man

[Zhang Sen <zhangsen ict ac cn>]

In the third paragraph of the DESCRIPTION section:

       beagle-build-index will index the data specified by  the  path  argu‐
       ments  and create an index in the index_path directory. If a suitable
       index is found in the index directory, if will  automatically  append
                                              ~~
       data  to the index if the file at hand has been modified since it was
       last indexed. If it can’t find a suitable index (non-existant or ver‐
       sion-mismatch) is will purge the directory recursively.

That marked "if" should be "it", I think.

Thank you.

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