Tutorial: Clarify Step 3

Help/guide/tutorial/Adding Usage Requirements for a Library.rst

@@ -127,7 +127,7 @@ Remove this line:
 
   </details>
 
-And the lines:
+And remove ``EXTRA_INCLUDES`` from ``target_include_directories``:
 
 .. raw:: html
 
@@ -143,23 +143,6 @@ And the lines:
 
   </details>
 
-The remaining code looks like:
-
-.. raw:: html
-
-  <details><summary>Click to show/hide the resulting code</summary>
-
-.. literalinclude:: Step4/CMakeLists.txt
-  :caption: Remaining code after removing EXTRA_INCLUDES
-  :name: CMakeLists.txt-after-removing-EXTRA_INCLUDES
-  :language: cmake
-  :start-after: add_subdirectory(MathFunctions)
-
-.. raw:: html
-
-  </details>
-
-
 Notice that with this technique, the only thing our executable target does to
 use our library is call :command:`target_link_libraries` with the name
 of the library target. In larger projects, the classic method of specifying
@@ -309,8 +292,8 @@ and this:
   :caption: TODO 7: MathFunctions/CMakeLists.txt
   :name: MathFunctions-SqrtLibrary-target_link_libraries-step4
   :language: cmake
-  :start-after: target_link_libraries(SqrtLibrary
-  :end-before: endif()
+  :start-after: # link our compiler flags interface library
+  :end-before: target_link_libraries(MathFunctions PUBLIC SqrtLibrary)
 
 .. raw:: html