Update installation.md

[andife]

typo

What does this PR do?

Fixes # (issue)

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• Did you make sure your PR does only one thing, instead of bundling different changes together?
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• Did you write any new necessary tests? [not needed for typos/docs]
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[codecov]

Codecov Report

Merging #1228 (439923d) into master (8b78676) will decrease coverage by 15.66%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           master    #1228       +/-   ##
===========================================
- Coverage   91.12%   75.46%   -15.67%     
===========================================
  Files         284      284               
  Lines       12755    12755               
===========================================
- Hits        11623     9625     -1998     
- Misses       1132     3130     +1998     

Flag	Coverage Δ
unittests	75.46% <ø> (-15.67%)	⬇️

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

Impacted Files	Coverage Δ
flash/text/question_answering/collate.py	17.64% <0.00%> (-80.00%)	⬇️
flash/core/serve/dag/visualize.py	19.04% <0.00%> (-76.20%)	⬇️
flash/core/serve/component.py	21.69% <0.00%> (-72.65%)	⬇️
flash/core/integrations/labelstudio/visualizer.py	24.00% <0.00%> (-72.00%)	⬇️
flash/text/question_answering/input.py	28.04% <0.00%> (-67.08%)	⬇️
flash/text/question_answering/model.py	27.70% <0.00%> (-64.87%)	⬇️
flash/core/serve/flash_components.py	30.43% <0.00%> (-63.77%)	⬇️
flash/tabular/input.py	33.84% <0.00%> (-63.08%)	⬇️
flash/core/serve/interfaces/http.py	35.44% <0.00%> (-62.03%)	⬇️
flash/tabular/classification/utils.py	37.50% <0.00%> (-60.00%)	⬇️
... and 108 more

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