docs: Apply suggestion

Author: neznaika0

user_guide_src/source/libraries/sessions.rst

@@ -344,15 +344,13 @@ intend to reuse that same key in the same request, you'd want to use
 
 .. literalinclude:: sessions/036.php
 
-Flag Manipulation
-=================
+Changing the Session Key Type
+=============================
 
-Since the data is stored in the session and the Flashdata/Tempdata methods only manipulates flags, you can change the type for one value.
+Since session data values like Flashdata and Tempdata are differentiated only by internal flags, you can change a value's type without rewriting its data.
 
 .. literalinclude:: sessions/045.php
 
-You may never use it, but know that it works.
-
 Closing a Session
 =================
 

user_guide_src/source/libraries/sessions/045.php

@@ -8,10 +8,10 @@
  * echo session()->getFlashdata('alerts');
  */
 
-// Switch flag
+// You can switch the session key type from Flashdata to Tempdata like this:
 session()->markAsTempdata('alerts');
 
-// or rewrite
+// Or simply rewrite it directly
 session()->setTempdata('alerts', 'Operation success!');
 
 /**