Fix typo in error message

[achuth-amplify]

No description provided.

[c00kiemon5ter]

this particular error is in many places throughout the code, for example two lines after:

self.to_old.append(entity_descr.entity_id)
#    ^^^^^^

[c00kiemon5ter]

I have already fixed this and other typos as part of PR #518

[codecov-io]

Codecov Report

Merging #521 into master will increase coverage by 0.05%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #521      +/-   ##
==========================================
+ Coverage   65.13%   65.19%   +0.05%     
==========================================
  Files         100      100              
  Lines       25693    25693              
==========================================
+ Hits        16735    16750      +15     
+ Misses       8958     8943      -15

Impacted Files	Coverage Δ
src/saml2/mdstore.py	74.74% <100%> (ø)	⬆️
src/saml2/time_util.py	88.02% <0%> (+0.59%)	⬆️
src/saml2/validate.py	76.47% <0%> (+5.49%)	⬆️

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