Slightly adjust exception output text

[neiljp]

What does this PR do, and why?

This minor change ties together the older (file) and newer (hotkey) methods of obtaining the exception traceback, with some motivational text to include them in bug reports.

External discussion & connections

• Discussed in #zulip-terminal in topic
• Fully fixes #
• Partially fixes issue #
• Builds upon previous unmerged work in PR #
• Is a follow-up to work in PR Copy traceback from the Exception popup #1513
• Requires merge of PR #
• Merge will enable work on #

How did you test this?

• Manually - Behavioral changes
• Manually - Visual changes
• Adapting existing automated tests
• Adding automated tests for new behavior (or missing tests)
• Existing automated tests should already cover this (only a refactor of tested code)

Self-review checklist for each commit

• It is a minimal coherent idea
• It has a commit summary following the documented style (title & body)
• It has a commit summary describing the motivation and reasoning for the change
• It individually passes linting and tests
• It contains test additions for any new behavior
• It flows clearly from a previous branch commit, and/or prepares for the next commit

[neiljp]

@rsashank This was the small change I was referring to, at least the rewording - helpful?

[rsashank]

@rsashank This was the small change I was referring to, at least the rewording - helpful?

Yes, this looks good! I wasn't sure how to phrase it, so I couldn't make the change myself. Thanks for helping with that.