docs: amend code style rule for null pointers
refs #2101
Change-Id: Idc60c2a297a22c64186a3bb7f4a56f7e5445791f
diff --git a/docs/code-style.rst b/docs/code-style.rst
index a5ed3c1..f282448 100644
--- a/docs/code-style.rst
+++ b/docs/code-style.rst
@@ -823,7 +823,7 @@
instance breaking out of deeply nested structures) should goto be considered, and only if
the alternative structured counterpart is proven to be less readable.
-3.20. "0" should be used instead of "NULL".
+3.20. ``nullptr`` should be used to represent a null pointer, instead of "0" or "NULL".
3.21. Logical units within a block should be separated by one blank line.