Clarify 'rename tag' exercise

doc/DeveloperGuide.md

@@ -45,7 +45,7 @@ Priority | As a ... | I want to ... | So that I can...
 `* * *` | user | add a new person |
 `* * *` | user | delete a person | remove entries that I no longer need
 `* * *` | user | find a person by name | locate details of persons without having to go through the entire list
-`* *` | user | hide [private contact details](#private-contact-detail) by default | to minimize chance of someone else seeing them by accident
+`* *` | user | hide [private contact details](#private-contact-detail) by default | minimize chance of someone else seeing them by accident
 `*` | user with many persons in the address book | sort persons by name | locate a person easily
 
 

doc/LearningOutcomes.md

@@ -25,9 +25,10 @@ After studying this code and completing the corresponding exercises, you should
 
 ## Utilize use cases `[LO-UseCases]`
 
-#### Exercise: Add an 'Edit tag' use case 
-* Add a use case to the `DeveloperGuide.md` to cover the case of editing an existing tag.<br> 
-  e.g. change tag `friends` to `buddies` <br>
+#### Exercise: Add a 'Rename tag' use case 
+* Add a use case to the `DeveloperGuide.md` to cover the case of *renaming of an existing tag*.<br> 
+  e.g. rename the tag `friends` to `buddies` (i.e. all persons who had the `friends` tag will now have 
+  a `buddies` tag instead)<br>
   Assume that AddressBook confirms the change with the user before carrying out the operation. 
 
 ------------------------------------------------------------------------------------------------------