ARROW-14975: [Docs] Fix typo in emit_dictionary_deltas documentation

[zixi-bwang]

Typo in \arrow\cpp\src\arrow\ipc\options.h, in my understanding, it should be emitted, not omitted.

[github-actions]

Thanks for opening a pull request!

If this is not a minor PR. Could you open an issue for this pull request on JIRA? https://issues.apache.org/jira/browse/ARROW

Opening JIRAs ahead of time contributes to the Openness of the Apache Arrow project.

Then could you also rename pull request title in the following format?

ARROW-${JIRA_ID}: [${COMPONENT}] ${SUMMARY}

or

MINOR: [${COMPONENT}] ${SUMMARY}

See also:

• Other pull requests
• Contribution Guidelines - How to contribute patches

[github-actions]

https://issues.apache.org/jira/browse/ARROW-14975

[github-actions]

⚠️ Ticket has not been started in JIRA, please click 'Start Progress'.

[pitrou]

Typo in \arrow\cpp\src\arrow\ipc\options.h, in my understanding, it should be emitted, not omitted.

Indeed!

[ursabot]

Benchmark runs are scheduled for baseline = 5d44cb8 and contender = e63ba1c. e63ba1c is a master commit associated with this PR. Results will be available as each benchmark for each run completes.
Conbench compare runs links:
[Finished ⬇️0.0% ⬆️0.0%] ec2-t3-xlarge-us-east-2
[Finished ⬇️0.45% ⬆️0.0%] ursa-i9-9960x
[Finished ⬇️0.44% ⬆️0.18%] ursa-thinkcentre-m75q
Supported benchmarks:
ec2-t3-xlarge-us-east-2: Supported benchmark langs: Python. Runs only benchmarks with cloud = True
ursa-i9-9960x: Supported benchmark langs: Python, R, JavaScript
ursa-thinkcentre-m75q: Supported benchmark langs: C++, Java