Merge #12896: docs: Fix conflicting statements about initialization in developer notes

b119e78 docs: Fix conflicting statements about initialization in developer notes (practicalswift)

Pull request description:

  Fix conflicting statements about initialization in developer notes.

  Context: https://github.com/bitcoin/bitcoin/pull/12785#issuecomment-378941151

Tree-SHA512: 601b18cbeb963f99a4180e652d6c1b78210df89743fd3565c0bce95fd2dcc9784b6af212795a43d3a40a5858b1a03e0d2c7982295c92d6ea710db0e6ee69f0b4

doc/developer-notes.md

@@ -450,12 +450,21 @@ C++ data structures
 
 - Vector bounds checking is only enabled in debug mode. Do not rely on it
 
-- Make sure that constructors initialize all fields. If this is skipped for a
+- Initialize all non-static class members where they are defined.
-  good reason (i.e., optimization on the critical path), add an explicit
+  If this is skipped for a good reason (i.e., optimization on the critical
-  comment about this
+  path), add an explicit comment about this
 
   - *Rationale*: Ensure determinism by avoiding accidental use of uninitialized
     values. Also, static analyzers balk about this.
+    Initializing the members in the declaration makes it easy to
+    spot uninitialized ones.
+
+```cpp
+class A
+{
+    uint32_t m_count{0};
+}
+```
 
 - By default, declare single-argument constructors `explicit`.
 
@@ -474,18 +483,6 @@ C++ data structures
   - *Rationale*: Easier to understand what is happening, thus easier to spot mistakes, even for those
   that are not language lawyers
 
-- Initialize all non-static class members where they are defined
-
-  - *Rationale*: Initializing the members in the declaration makes it easy to spot uninitialized ones,
-  and avoids accidentally reading uninitialized memory
-
-```cpp
-class A
-{
-    uint32_t m_count{0};
-}
-```
-
 Strings and formatting
 ------------------------