[3.13] gh-102511: Change the os.path.splitroot param name from path back to p (GH-124097) (#124919)

(cherry picked from commit 3b6bfa7)

Co-authored-by: sobolevn <mail@sobolevn.me>

Author: JelleZijlstra

Modules/clinic/posixmodule.c.h

@@ -5503,7 +5503,7 @@ os__path_isjunction_impl(PyObject *module, path_t *path)
 /*[clinic input]
 os._path_splitroot_ex
 
-    path: path_t(make_wide=True, nonstrict=True)
+    p as path: path_t(make_wide=True, nonstrict=True)
 
 Split a pathname into drive, root and tail.
 
@@ -5512,7 +5512,7 @@ The tail contains anything after the root.
 
 static PyObject *
 os__path_splitroot_ex_impl(PyObject *module, path_t *path)
-/*[clinic end generated code: output=4b0072b6cdf4b611 input=6eb76e9173412c92]*/
+/*[clinic end generated code: output=4b0072b6cdf4b611 input=4556b615c7cc13f2]*/
 {
     Py_ssize_t drvsize, rootsize;
     PyObject *drv = NULL, *root = NULL, *tail = NULL, *result = NULL;