fix a few typos

[t-bltg]

• fix a few typos;
• add upcoming 1.10 rc to CI;
• relax nightly for failures.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (bd10d07) 99.66% compared to head (797e2df) 99.71%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #363      +/-   ##
==========================================
+ Coverage   99.66%   99.71%   +0.04%     
==========================================
  Files          36       36              
  Lines        2073     2073              
==========================================
+ Hits         2066     2067       +1     
+ Misses          7        6       -1     

see 1 file with indirect coverage changes

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