Fix a small bug in the heading levels

pieterhijma · chennes · commit bc089a0f7e0c · 2025-04-04T08:05:40.000-05:00
diff --git a/bestpractices/c++practices.md b/bestpractices/c++practices.md
@@ -445,7 +445,7 @@ constexpr auto redDogColor {"red"}; // OK
 ```
 See also variable sets.
 
-# Out parameters
+## Out parameters
 
 Out parameters are _non-const, by-reference, or by-pointer_, function parameters. These are known to cause hard to find bugs.
 
