[ARROW-11216] [Rust] Improve documentation for StringDictionaryBuilder

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 4.0.0
• Component/s: Rust
• Labels: pull-request-available
• External issue URL: https://github.com/apache/arrow/issues/27121
• Assignee: Andrew Lamb
• Reporter: Andrew Lamb
• Created: 11/Jan/21 22:57
• Updated: 11/Jan/23 08:18
• Resolved: 19/Jan/21 17:59

Description

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

Issue Links

• links to: GitHub Pull Request #9169