[jira] [Created] (ARROW-11216) [Rust] Improve documentation for StringDictionaryBuilder

[Andrew Lamb (Jira)]

Andrew Lamb created ARROW-11216:
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             Summary: [Rust] Improve documentation for StringDictionaryBuilder
                 Key: ARROW-11216
                 URL: https://issues.apache.org/jira/browse/ARROW-11216
             Project: Apache Arrow
          Issue Type: Improvement
            Reporter: Andrew Lamb
            Assignee: Andrew Lamb


I find myself trying to remember the exact incantation to create a 
`StringDictionaryBuilder` so it should be a doc example



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