Fix manpage typos

[martingkelly]

Simple manpage typos found by Lintian as part of the Debian packaging process.

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.60%. Comparing base (224745b) to head (6667765).
Report is 42 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #508      +/-   ##
==========================================
+ Coverage   85.52%   85.60%   +0.07%     
==========================================
  Files          50       50              
  Lines       11656    11650       -6     
  Branches     2202     2201       -1     
==========================================
+ Hits         9969     9973       +4     
+ Misses       1687     1677      -10     

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[casevh]

Thanks!