Update CHANGELOG

Not sure if I've managed to capture everything. Please take a look :)

pycardium/modules/py/config.py

@@ -6,22 +6,22 @@ def set_string(key, value):
     Write a string to the configuration file ``card10.cfg``.
 
     Both ``key`` and ``value`` must be strings or must be
-    convertible to a string using the ``str()`` function.
+    convertible to a string using the :py:func:`str()` function.
 
     ``key`` must not contain spaces, control characters (including tabs),
     number signs ans equal signs.
-    ``value` must not contain control characters (including tabs).
-    Neither is allowed to contain the sub-string ``execute_elf``.
+    ``value`` must not contain control characters (including tabs).
+    Neither is allowed to contain the sub-string ``"execute_elf"``.
 
     The key/value pair is immediately written to the configuration
     file (``card10.cfg``). After the file is written, configuration
-    is read again and the new value is available via ``config.get_string``.
+    is read again and the new value is available via :py:func:`config.get_string`.
 
     :param str key:     Name of the configuration option.
     :param str value:   Value to write.
     :raises OSError: If writing to the configuration file failed.
     :raises OSError: If key or value contain illegal characters.
-    :raises ValueError: If key or value contain the sub-string ``execute_elf``.
+    :raises ValueError: If key or value contain the sub-string ``"execute_elf"``.
 
     .. versionadded:: 1.16
     """
@@ -34,7 +34,7 @@ def get_string(key):
     Read a string from the configuration file ``card10.cfg``.
 
     ``key`` must be a string or must be convertible to a string using
-    the ``str()`` function.
+    the :py:func:`str()` function.
 
 
     :param str key: Name of the configuration option.