Fix code reference lines in the action (cpp) documentation (#5054)

Reference code lines for the part " The constructor also instantiates a new action server" are corrected.

Signed-off-by: MortezaH <[email protected]>

Author: MortezaHagh

source/Tutorials/Intermediate/Writing-an-Action-Server-Client/Cpp.rst

@@ -153,7 +153,7 @@ The constructor also instantiates a new action server:
 
 .. literalinclude:: scripts/server.cpp
     :language: c++
-    :lines: 86-91
+    :lines: 52-57
 
 An action server requires 6 things: