Fix some typos

[asherf]

No description provided.

[codecov]

Codecov Report

Merging #160 into master will not change coverage.
The diff coverage is 100%.

@@ Coverage Diff @@## master #160 +/- ##
=======================================
Coverage 96.55% 96.55% =======================================
Files 14 14 Lines 1075 1075 =======================================
Hits 1038 1038 Misses 37 37

Impacted Files	Coverage Δ
jose/backends/ecdsa_backend.py	98.66% <100%> (ø)	⬆️
jose/backends/cryptography_backend.py	98.11% <100%> (ø)	⬆️
jose/jwk.py	95.12% <100%> (ø)	⬆️
jose/backends/rsa_backend.py	96.5% <100%> (ø)	⬆️
jose/backends/pycrypto_backend.py	95.76% <100%> (ø)	⬆️

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[asherf]

@blag ping

[blag]

Thanks!