Update documentation/demos based on cleanup

docs/source/yosys_internals/extending_yosys/extensions.rst

@@ -230,8 +230,7 @@ Use ``log_error()`` to report a non-recoverable error:
 .. code:: C++
 
     if (design->modules.count(module->name) != 0)
-        log_error("A module with the name %s already exists!\n",
-                   RTLIL::id2cstr(module->name));
+        log_error("A module with the name %s already exists!\n", module);
 
 Use ``log_cmd_error()`` to report a recoverable error:
 

docs/source/yosys_internals/extending_yosys/functional_ir.rst

@@ -181,7 +181,7 @@ pointer ``f`` to the output file, or stdout if none is given.
 
 For this minimal example all we are doing is printing out each node.  The
 ``node.name()`` method returns an ``RTLIL::IdString``, which we convert for
-printing with ``id2cstr()``.  Then, to print the function of the node, we use
+printing with ``unescape()``.  Then, to print the function of the node, we use
 ``node.to_string()`` which gives us a string of the form ``function(args)``. The
 ``function`` part is the result of ``Functional::IR::fn_to_string(node.fn())``;
 while ``args`` is the zero or more arguments passed to the function, most