Updated tour.rst. Fixed grammatical mistake.

[kapoormanish]

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Checklist

• Documentation is written and is accurate;
• make check passes with no errors
• Update rebar.config.script with the commit hash once this PR is rebased and merged

[flimzy]

Thanks for your contribution. Two observations:

1. The change introduces trailing whitespace which is prohibited by the build scripts:

    /home/travis/build/apache/couchdb-documentation/src/intro/tour.rst
      line 245 : trailing whitespace detected!
   

2. There's no actual grammatical mistake. "Take some getting used to" is a common idiomatic expression (at least in American English). Although having said that, I would not be surprised if a large number of non-native speakers wouldn't know this, and your addition of the word "time" alleviates any ambiguity without substantially changing the meaning. So while I don't consider it a mistake, I approve the spirit of the change. :)