Spelling corrections

A number of spelling corrections as reported by the codespell (see: https://github.com/codespell-project/codespell) program and lists.

Some remarks:
- not considered are grammatical errors
- not considered are names in the code although there are a number that could be improved (like `childs` -> `children`)
- in the documentation it could be made clearer what are variables and what is running text (e.g. by placing variables in running text between backticks)
- some comments are in the French language, I think it would be better to have them in the English (United States version).

1 files changed, 1 insertions, 1 deletions

diff --git a/src/GudhUI/utils/Critical_points.h b/src/GudhUI/utils/Critical_points.h
index 97e58737..65695434 100644
--- a/src/GudhUI/utils/Critical_points.h
+++ b/src/GudhUI/utils/Critical_points.h
@@ -103,7 +103,7 @@ template<typename SkBlComplex> class Critical_points {
       // reduced to one point -> contractible
       return 1;
     else
-      // we dont know
+      // we don't know
       return 2;
   }