pythonGH-120794: Use example paths with multiple parts in pathlib docs

In the documentation of `PosixPath` and `WindowsPath`, and their `Pure*`
equivalents, use example paths with multiple non-anchor parts.

Doc/library/pathlib.rst

@@ -178,8 +178,8 @@ we also call *flavours*:
    A subclass of :class:`PurePath`, this path flavour represents non-Windows
    filesystem paths::
 
-      >>> PurePosixPath('/etc')
-      PurePosixPath('/etc')
+      >>> PurePosixPath('/etc/hosts')
+      PurePosixPath('/etc/hosts')
 
    *pathsegments* is specified similarly to :class:`PurePath`.
 
@@ -188,8 +188,8 @@ we also call *flavours*:
    A subclass of :class:`PurePath`, this path flavour represents Windows
    filesystem paths, including `UNC paths`_::
 
-      >>> PureWindowsPath('c:/Program Files/')
-      PureWindowsPath('c:/Program Files')
+      >>> PureWindowsPath('c:/', 'Users', 'Me')
+      PureWindowsPath('c:/Users/Me')
       >>> PureWindowsPath('//server/share/file')
       PureWindowsPath('//server/share/file')
 
@@ -783,8 +783,8 @@ calls on path objects.  There are three ways to instantiate concrete paths:
    A subclass of :class:`Path` and :class:`PurePosixPath`, this class
    represents concrete non-Windows filesystem paths::
 
-      >>> PosixPath('/etc')
-      PosixPath('/etc')
+      >>> PosixPath('/etc/hosts')
+      PosixPath('/etc/hosts')
 
    *pathsegments* is specified similarly to :class:`PurePath`.
 
@@ -798,8 +798,8 @@ calls on path objects.  There are three ways to instantiate concrete paths:
    A subclass of :class:`Path` and :class:`PureWindowsPath`, this class
    represents concrete Windows filesystem paths::
 
-      >>> WindowsPath('c:/Program Files/')
-      WindowsPath('c:/Program Files')
+      >>> WindowsPath('c:/', 'Users', 'Me')
+      WindowsPath('c:/Users/Me')
 
    *pathsegments* is specified similarly to :class:`PurePath`.