doc: Section explaining Jira OAuth app permissions [CF-2052]

[afsmeira]

Wait until https://codacy.atlassian.net/browse/CF-2052 is concluded. Add any necessary documentation after that.

👀 Live preview

🚧 To do

• If relevant, include the Jira issue key at the end of the pull request title
• Perform a self-review of the changes
• Fix any issues reported by the CI/CD

[github-actions]

Overall readability score: 52.75 (🟢 +0.01)

File	Readability
jira-integration.md	42.13 (🟢 +1.55)

View detailed metrics

🟢 - Shows an increase in readability
🔴 - Shows a decrease in readability

File	Readability	FRE	GF	ARI	CLI	DCRS
jira-integration.md	42.13	29.18	13.87	15.8	12.6	7.74
	🟢 +1.55	🟢 +1.12	🟢 +0.62	🟢 +0.4	🔴 -0.29	🟢 +0.04

Averages:

	Readability	FRE	GF	ARI	CLI	DCRS
Average	52.75	42.67	11.02	12.76	12.65	8.01
	🟢 +0.01	🟢 +0	🟢 +0	🟢 +0	🟢 +0	🟢 +0

View metric targets

Metric	Range	Ideal score
Flesch Reading Ease	100 (very easy read) to 0 (extremely difficult read)	60
Gunning Fog	6 (very easy read) to 17 (extremely difficult read)	8 or less
Auto. Read. Index	6 (very easy read) to 14 (extremely difficult read)	8 or less
Coleman Liau Index	6 (very easy read) to 17 (extremely difficult read)	8 or less
Dale-Chall Readability	4.9 (very easy read) to 9.9 (extremely difficult read)	6.9 or less

[DMarinhoCodacy]

LGTM!