Change helper message to more accurately reflect reality; add link to…

[law]

Description

Fixes #1597

Status

READY

Type of change

• Documentation (fix or adds documentation)

How Has This Been Tested?

Checklist:

• I have performed a self-review of my own code
• I have made corresponding changes to the documentation (if applicable)
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[codecov]

Codecov Report

Merging #1598 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1598   +/-   ##
=======================================
  Coverage   99.88%   99.88%           
=======================================
  Files          53       53           
  Lines        3343     3343           
=======================================
  Hits         3339     3339           
  Misses          4        4           

Impacted Files	Coverage Δ
opsdroid/helper.py	100.00% <ø> (ø)

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[FabioRosado]

Again thank you for both raising the issue and the PR to fix this.

I am happy with the changes, and the CI failure doesn't have to do with this PR so I'll merge it as soon as possible 😄 👍