Improve the README/documentation as suggested by gemini-cli

Author: Martchus

README.md

@@ -28,7 +28,7 @@ using namespace CppUtilities::EscapeCodes;
 
 /*!
  *  \namespace CppUtilities
- *  \brief Contains all utilities provides by the c++utilities library.
+ *  \brief Contains all utilities provided by the c++utilities library.
  */
 namespace CppUtilities {
 

application/argumentparser.cpp

@@ -414,7 +414,7 @@ template <typename... TargetType> std::tuple<TargetType...> Argument::valuesAs(s
 }
 
 /*!
- * \brief Converts the present values for all occurrence to the specified target types. For each occurrence, there must be as many values present as types are specified.
+ * \brief Converts the present values for all occurrences to the specified target types. For each occurrence, there must be as many values present as types are specified.
  * \throws Throws ArgumentUtilities::Failure when the number of present values is not sufficient or a conversion error occurs.
  * \remarks Still experimental. Might be removed/adjusted in next minor release.
  */

application/argumentparser.h

@@ -12,7 +12,7 @@ namespace CppUtilities {
  * Note the absence of the TimeSpan::totalYears() and TimeSpan::totalMonth() methods.
  * The reason for this limitation of the TimeSpan class is that the TimeSpan is meant to express
  * a duration independently of the concrete starting DateTime and end DateTime.
- * However, the concrete calendar interval is neccassary for expressing a duration in terms of years
+ * However, the concrete calendar interval is necessary for expressing a duration in terms of years
  * and months because not all years and months have the same length.
  *
  * The Period class, on the other hand, expresses the duration between a *concrete* starting DateTime