doc: fix docstrings for SymbolTable

[niklasdewally]

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[github-actions]

Code and Documentation Coverage Report

Documentation Coverage

This PR:

conjure_core: 3% with examples, 55% documented -- 8/145/271
conjure_oxide: 0% with examples, 19% documented -- 0/4/36
minion_rs: 30% with examples, 82% documented -- 2/23/112
tree-morph: 42% with examples, 100% documented -- 8/22/22

Main:

conjure_core: 3% with examples, 55% documented -- 8/144/271
conjure_oxide: 0% with examples, 19% documented -- 0/4/36
minion_rs: 30% with examples, 82% documented -- 2/23/112
tree-morph: 42% with examples, 100% documented -- 8/22/22

View full documentation coverage for main, this PR

Code Coverage Summary

This PR: Detailed Report

  functions..: 65.8% (644 of 979 functions)
  branches...: no data found

Main: Detailed Report

  functions..: 65.8% (644 of 979 functions)
  branches...: no data found

Coverage Main & PR Coverage Change

Functions coverage changed by 0.00% and covered lines changed by 0
Branches... coverage: No comparison data available