fix: exam submit email content

[Anas12091101]

Description:

This PR modifies the exam submit email message to avoid confusion among the learners.

Issues:

https://github.com/mitodl/hq/issues/708
https://github.com/mitodl/hq/issues/720

Pre-Merge Checklist:

• Updated the version number in edx_proctoring/__init__.py and package.json if these changes are to be released.
• Described your changes in CHANGELOG.rst
• Confirmed Github reports all automated tests/checks are passing.
• Approved by at least one additional reviewer.

Post-Merge:

• Create a tag matching the new version number.

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[pdpinch]

Text changes look good, thank you.

If we're bumping the version to 5.1.0 shouldn't we add a note to the changelog?

[UsamaSadiq]

This seems like a minor change so a patch version upgrade should be enough for this.
Bumping the version to 5.0.2 should suffice.

Suggested change

	__version__ = '5.1.0'
	__version__ = '5.0.2'

[UsamaSadiq]

A patch version upgrade should be enough for this change.

Suggested change

	"version": "5.1.0",
	"version": "5.0.2",

[e0d]

@Anas12091101 it looks like there's one failing test check.

[Anas12091101]

@e0d the error in the check is coming on other PRs as well. Maybe this could help: karma-runner/karma#1270 (comment)