tracker-search: Clarify help text
Following up from a forum thread.
In the help screen for tracker-search:
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The EXPRESSION argument is renamed to TERMS.
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A short program summary is shown on the help page.
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Options relating to the search type are moved to an option group.
In the tracker-search man page:
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The "expression" argument is renamed to "search-terms".
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The description text is rearranged to put the most important information first. Some sentences are reworded for clarity.
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Documentation for options which no longer exist (emails, contacts, bookmarks) is deleted.