gh-156517: Clarify that `site.getsitepackages()` doesn't check for existance (#156524)

Co-authored-by: Barry Warsaw <barry@python.org>

Doc/library/site.rst

diff --git a/Doc/library/site.rst b/Doc/library/site.rst
index fe87182..090c4ef 100644
--- a/Doc/library/site.rst
+++ b/Doc/library/site.rst
@@ -453,9 +453,10 @@
 
    Return a list containing all global site-packages directories.
 
-   For each directory present in *prefixes* (or :data:`PREFIXES` if *prefixes*
-   is ``None``), this function will find its site-packages subdirectory
-   depending on the system environment, and will return a list of full paths.
+   For each directory given in *prefixes* (or :data:`PREFIXES` if *prefixes*
+   is ``None``), this function will compute its site-packages subdirectory
+   depending on the system environment, and will return a list of full paths,
+   which are not checked for existence.
 
    .. versionadded:: 3.2