docs(api): docstring for load_trash_bin()

[ecormany]

Overview

Adds an API Reference entry for load_trash_bin()

Further explanation of needing a trash container in every protocol will go in article pages, in a separate PR.

Test Plan

Check out the entry in the sandbox.

Changelog

New docstring only.

Review requests

Oll korrect?

Risk assessment

none, docstring.

[codecov]

Codecov Report

Merging #14108 (92fedd3) into chore_release-7.1.0 (4aced90) will not change coverage.
Report is 2 commits behind head on chore_release-7.1.0.
The diff coverage is n/a.

Additional details and impacted files

@@                 Coverage Diff                  @@
##           chore_release-7.1.0   #14108   +/-   ##
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  Coverage                70.44%   70.44%           
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  Files                     1636     1636           
  Lines                    54470    54470           
  Branches                  4008     4008           
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  Hits                     38369    38369           
  Misses                   15407    15407           
  Partials                   694      694           

Flag	Coverage Δ
g-code-testing	96.44% <ø> (ø)
notify-server	89.13% <ø> (ø)

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Files	Coverage Δ
api/src/opentrons/protocol_api/protocol_context.py	92.30% <ø> (ø)

[SyntaxColoring]

wurd