Typos found by codespell

Run codespell in CI

.github/workflows/codespell.yml

@@ -0,0 +1,13 @@
+---
+name: Codespell
+on: [push, pull_request]
+jobs:
+  codespell:
+    name: Check for spelling errors
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: codespell-project/actions-codespell@master
+        with:
+          skip: ca_hashes.txt,tls_data.txt,*.pem,OPENSSL-LICENSE.txt
+          ignore_words_list: borken,gost,ciph,ba,bloc,isnt,chello,fo,alle,nmake