Issue #26896: Disambiguate uses of "importer" with "finder".

Thanks to Oren Milman for the patch.
diff --git a/Lib/runpy.py b/Lib/runpy.py
index af6205d..6b6fc24 100644
--- a/Lib/runpy.py
+++ b/Lib/runpy.py
@@ -98,7 +98,7 @@
     # may be cleared when the temporary module goes away
     return mod_globals.copy()
 
-# Helper to get the loader, code and filename for a module
+# Helper to get the full name, spec and code for a module
 def _get_module_details(mod_name, error=ImportError):
     if mod_name.startswith("."):
         raise error("Relative module names not supported")
@@ -253,7 +253,7 @@
         return _run_module_code(code, init_globals, run_name,
                                 pkg_name=pkg_name, script_name=fname)
     else:
-        # Importer is defined for path, so add it to
+        # Finder is defined for path, so add it to
         # the start of sys.path
         sys.path.insert(0, path_name)
         try: