doxygen: fixed error messages

lib/preprocessor.cpp

@@ -1397,7 +1397,9 @@ private:
     void operator=(const PreprocessorMacro &);
 public:
     /**
-     * @param macro The code after #define, until end of line,
+     * @brief Constructor for PreprocessorMacro. This is the "setter"
+     * for this class - everything is setup here.
+     * @param macro The code after define, until end of line,
      * e.g. "A(x) foo(x);"
      */
     PreprocessorMacro(const std::string &macro)

lib/preprocessor.h

@@ -123,6 +123,8 @@ protected:
     /**
      * Remove comments from code. This should only be called from read().
      * @param str Code processed by read().
+     * @param filename filename
+     * @param settings Settings. If there are inline suppressions these will be added to the settings
      * @return code without comments
      * @throws std::runtime_error when code contains unhandled characters
      */

lib/settings.h

@@ -150,8 +150,8 @@ public:
         void addSuppression(const std::string &errorId, const std::string &file = "", unsigned int line = 0);
 
         /**
-         * Returns true if this message should not be shown to the user.
-         * @param errorId, the id for the error, e.g. "arrayIndexOutOfBounds"
+         * @brief Returns true if this message should not be shown to the user.
+         * @param errorId the id for the error, e.g. "arrayIndexOutOfBounds"
          * @param file File name with the path, e.g. "src/main.cpp"
          * @param line number, e.g. "123"
          * @return true if this error is suppressed.