Merge bitcoin#10381: Shadowing warnings are not enabled by default, update doc accordingly

f203ecc Shadowing is not enabled by default, update doc accordingly. (Pavel Janík)

Tree-SHA512: a7170827caa9d35457356808445ef2387fd2edde72fb76c6241cfd5decad218558b307d223e86bb66041576b638f90f6efa8a46ea6208d43da275a993617c997

Author: laanwj

doc/developer-notes.md

@@ -346,10 +346,9 @@ Strings and formatting
 Variable names
 --------------
 
-The shadowing warning (`-Wshadow`) is enabled by default. It prevents issues rising
-from using a different variable with the same name.
-
-Please name variables so that their names do not shadow variables defined in the source code.
+Although the shadowing warning (`-Wshadow`) is not enabled by default (it prevents issues rising
+from using a different variable with the same name),
+please name variables so that their names do not shadow variables defined in the source code.
 
 E.g. in member initializers, prepend `_` to the argument name shadowing the
 member name: