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, 2 insertions, 2 deletions

diff --git a/src/Simplex_tree/test/simplex_tree_graph_expansion_unit_test.cpp b/src/Simplex_tree/test/simplex_tree_graph_expansion_unit_test.cpp
index 6d63d8ae..54e23204 100644
--- a/src/Simplex_tree/test/simplex_tree_graph_expansion_unit_test.cpp
+++ b/src/Simplex_tree/test/simplex_tree_graph_expansion_unit_test.cpp
@@ -93,7 +93,7 @@ BOOST_AUTO_TEST_CASE_TEMPLATE(simplex_tree_expansion_with_blockers_3, typeST, li
         std::clog << vertex << ", ";
       }
       std::clog << "] ( " << simplex_tree.filtration(sh);
-      // User can re-assign a new filtration value directly in the blocker (default is the maximal value of boudaries)
+      // User can re-assign a new filtration value directly in the blocker (default is the maximal value of boundaries)
       simplex_tree.assign_filtration(sh, simplex_tree.filtration(sh) + 1.);
 
       std::clog << " + 1. ) = " << result << std::endl;
@@ -160,7 +160,7 @@ BOOST_AUTO_TEST_CASE_TEMPLATE(simplex_tree_expansion_with_blockers_2, typeST, li
         std::clog << vertex << ", ";
       }
       std::clog << "] ( " << simplex_tree.filtration(sh);
-      // User can re-assign a new filtration value directly in the blocker (default is the maximal value of boudaries)
+      // User can re-assign a new filtration value directly in the blocker (default is the maximal value of boundaries)
       simplex_tree.assign_filtration(sh, simplex_tree.filtration(sh) + 1.);
 
       std::clog << " + 1. ) = " << result << std::endl;