gh-140505: Correct "parameters" to "arguments" in MultiCall doc

Doc/library/xmlrpc.client.rst

@@ -15,7 +15,7 @@
 --------------
 
 XML-RPC is a Remote Procedure Call method that uses XML passed via HTTP(S) as a
-transport.  With it, a client can call methods with parameters on a remote
+transport.  With it, a client can call methods with arguments on a remote
 server (the server is named by a URI) and get back structured data.  This module
 supports writing XML-RPC client code; it handles all the details of translating
 between conformable Python objects and XML on the wire.
@@ -195,18 +195,21 @@ grouped under the reserved :attr:`~ServerProxy.system` attribute:
 
 .. method:: ServerProxy.system.methodSignature(name)
 
-   This method takes one parameter, the name of a method implemented by the XML-RPC
+   This method takes one argument, the name of a method implemented by the XML-RPC
    server. It returns an array of possible signatures for this method. A signature
    is an array of types. The first of these types is the return type of the method,
    the rest are parameters.
 
    Because multiple signatures (ie. overloading) is permitted, this method returns
    a list of signatures rather than a singleton.
 
-   Signatures themselves are restricted to the top level parameters expected by a
-   method. For instance if a method expects one array of structs as a parameter,
-   and it returns a string, its signature is simply "string, array". If it expects
-   three integers and returns a string, its signature is "string, int, int, int".
+   Note that a signature does not give details of a complex type; it just gives the
+   basic XML-RPC type — array or structure. This applies to both arguments and the
+   return value. For example, if a method expects one array of structs as an argument
+   and returns a string, its signature is simply "string, array". Here, "string" is
+   the return type, and "array" indicates the argument type without showing the structure
+   of its elements. If a method expects three integers and returns an array of strings,
+   its signature is "array, int, int, int".
 
    If no signature is defined for the method, a non-array value is returned. In
    Python this means that the type of the returned  value will be something other
@@ -215,7 +218,7 @@ grouped under the reserved :attr:`~ServerProxy.system` attribute:
 
 .. method:: ServerProxy.system.methodHelp(name)
 
-   This method takes one parameter, the name of a method implemented by the XML-RPC
+   This method takes one argument, the name of a method implemented by the XML-RPC
    server.  It returns a documentation string describing the use of that method. If
    no such string is available, an empty string is returned. The documentation
    string may contain HTML markup.
@@ -472,7 +475,7 @@ remote server into a single request [#]_.
 
    Create an object used to boxcar method calls. *server* is the eventual target of
    the call. Calls can be made to the result object, but they will immediately
-   return ``None``, and only store the call name and parameters in the
+   return ``None``, and only store the call name and arguments in the
    :class:`MultiCall` object. Calling the object itself causes all stored calls to
    be transmitted as a single ``system.multicall`` request. The result of this call
    is a :term:`generator`; iterating over this generator yields the individual