[Doc] Add evaluation doc

[xiexinch]

Motivation

As title.

Modification

• add docs/en/advanced_guides/evaluation.md
• fix typos in mmseg/evaluation/metrics/iou_metric.py
• remove parameters docstring and fix a bug in mmseg/evaluation/metrics/citys_metric.py

[codecov[bot]]

Codecov Report

Base: 83.53% // Head: 83.55% // Increases project coverage by +0.02% :tada:

Coverage data is based on head (d689705) compared to base (00c5e80). Patch coverage: 100.00% of modified lines in pull request are covered.

:exclamation: Current head d689705 differs from pull request most recent head 5223691. Consider uploading reports for the commit 5223691 to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           dev-1.x    #2077      +/-   ##
===========================================
+ Coverage    83.53%   83.55%   +0.02%     
===========================================
  Files          138      138              
  Lines         7790     7790              
  Branches      1167     1167              
===========================================
+ Hits          6507     6509       +2     
+ Misses        1106     1104       -2     
  Partials       177      177              

Flag	Coverage Δ
unittests	83.55% <100.00%> (+0.02%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
mmseg/evaluation/metrics/iou_metric.py	77.41% <ø> (ø)
mmseg/evaluation/metrics/citys_metric.py	90.00% <100.00%> (ø)
mmseg/models/backbones/timm_backbone.py	45.83% <0.00%> (+8.33%)	:arrow_up:

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