update api docs

[DavidMinarsch]

Proposed changes

Fixes the api docs

Fixes

Types of changes

What types of changes does your code introduce to agents-aea?
Put an x in the boxes that apply

• Bugfix (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)

Checklist

Put an x in the boxes that apply.

• I have read the CONTRIBUTING doc
• I am making a pull request against the develop branch (left side). Also you should start your branch off our develop.
• Lint and unit tests pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works
• I have checked that code coverage does not decrease.
• I have checked that the documentation about the aea cli tool works
• I have added necessary documentation (if appropriate)
• Any dependent changes have been merged and published in downstream modules

Further comments

If this is a relatively large or complex change, kick off the discussion by explaining why you chose the solution you did and what alternatives you considered, etc...

[codecov-commenter]

Codecov Report

Merging #1500 into develop will decrease coverage by 0.04%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop    #1500      +/-   ##
===========================================
- Coverage    90.39%   90.34%   -0.05%     
===========================================
  Files          244      244              
  Lines        17277    17277              
===========================================
- Hits         15617    15609       -8     
- Misses        1660     1668       +8     

Flag	Coverage Δ
#unittests	90.34% <100.00%> (-0.05%)	⬇️

Impacted Files	Coverage Δ
packages/fetchai/connections/soef/connection.py	100.00% <100.00%> (ø)
aea/launcher.py	93.13% <0.00%> (-4.91%)	⬇️
...kages/fetchai/connections/p2p_libp2p/connection.py	99.07% <0.00%> (-0.93%)	⬇️

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