Fix documentation for the Sensor component

[adlarkin]

Signed-off-by: Ashton Larkin [email protected]

The Sensor component had a typo (link was used instead of sensor), so this is a quick fix.

Checklist

• Signed all commits for DCO
• Added tests
• Updated documentation (as needed)
• Updated migration guide (as needed)
• codecheck passed (See contributing)
• All tests passed (See test coverage)
• While waiting for a review on your PR, please help review another open pull request to support the maintainers

Note to maintainers: Remember to use Squash-Merge

[codecov]

Codecov Report

Merging #898 (55b887b) into ign-gazebo3 (dd9f7b5) will decrease coverage by 0.00%.
The diff coverage is n/a.

@@               Coverage Diff               @@
##           ign-gazebo3     #898      +/-   ##
===============================================
- Coverage        77.94%   77.94%   -0.01%     
===============================================
  Files              215      215              
  Lines            12077    12077              
===============================================
- Hits              9414     9413       -1     
- Misses            2663     2664       +1     

Impacted Files	Coverage Δ
include/ignition/gazebo/components/Sensor.hh	100.00% <ø> (ø)
src/Server.cc	82.80% <0.00%> (-0.64%)	⬇️

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