Fix markdown format error

[Techievena]

Fix markdown formatting error in docs/matchers/luis.ai.md

Description

Please include a summary of the change and which issue is fixed. Please also include relevant motivation and context. List any dependencies that are required for this change.

Fixes #

Status

READY | UNDER DEVELOPMENT | ON HOLD

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update
• Documentation (fix or adds documentation)

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration.

• Test A
• Test B

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

@@          Coverage Diff          @@
##           master   #809   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files          30     30           
  Lines        1934   1934           
=====================================
  Hits         1934   1934

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[jacobtomlinson]

Nice thanks!

[jacobtomlinson]

Ping me your address via DM on Twitter or Gitter and I'll post you some opsdroid stickers!