C++: modelling -> modeling

Co-authored-by: Jonas Jensen <jbj@github.com>

Author: geoffw0

cpp/ql/src/semmle/code/cpp/Namespace.qll

@@ -1,5 +1,5 @@
 /**
- * Provides classes for modelling namespaces, `using` directives and `using` declarations.
+ * Provides classes for modeling namespaces, `using` directives and `using` declarations.
  */
 
 import semmle.code.cpp.Element

cpp/ql/src/semmle/code/cpp/Type.qll

@@ -1,5 +1,5 @@
 /**
- * Provides a hierarchy of classes for modelling C/C++ types.
+ * Provides a hierarchy of classes for modeling C/C++ types.
  */
 
 import semmle.code.cpp.Element

cpp/ql/src/semmle/code/cpp/stmts/Stmt.qll

@@ -1,5 +1,5 @@
 /**
- * Provides a hierarchy of classes for modelling C/C++ statements.
+ * Provides a hierarchy of classes for modeling C/C++ statements.
  */
 
 import semmle.code.cpp.Element