doc/reference/index: Remove "Now that you have an overview" paragraph #4922
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This wording was originally from 58a1804 (#2688), which added it to the end of the guide (where telling readers what they know makes some sense). It was moved to a "Cargo in Depth" section with 01aa9e3 (#4453), where it makes a bit less sense. When that section became the reference index in 3f2d93e (#4455) the context assumed by the paragraph was completely missing.
This commit removes the paragraph, which doesn't reduce the usefulness of the reference index. And the removal avoids confusing readers who start with the reference docs and may now have the assumed overview.