Merge #15343: [doc] netaddress: Make IPv4 loopback comment more descriptive

87aa0b48af netaddress: Make IPv4 loopback comment more descriptive (Carl Dong)
6180b5f32b netaddress: Fix indentation in IsLocal (Carl Dong)

Pull request description:

  This also makes the comment match the IPv6 comment just below this hunk.

Tree-SHA512: 9b91195e71e18156c9e013f63a6d430c67951aabb4a0c2f48f3bf852570c13887572b9e2fa52f4e1beba8685a9cae8949d4d03cd618a78f88566cf9e85dc64a8

src/netaddress.cpp

@@ -182,16 +182,16 @@ bool CNetAddr::IsTor() const
 
 bool CNetAddr::IsLocal() const
 {
-    // IPv4 loopback
-   if (IsIPv4() && (GetByte(3) == 127 || GetByte(3) == 0))
-       return true;
+    // IPv4 loopback (127.0.0.0/8 or 0.0.0.0/8)
+    if (IsIPv4() && (GetByte(3) == 127 || GetByte(3) == 0))
+        return true;
 
-   // IPv6 loopback (::1/128)
-   static const unsigned char pchLocal[16] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1};
-   if (memcmp(ip, pchLocal, 16) == 0)
-       return true;
+    // IPv6 loopback (::1/128)
+    static const unsigned char pchLocal[16] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1};
+    if (memcmp(ip, pchLocal, 16) == 0)
+        return true;
 
-   return false;
+    return false;
 }
 
 bool CNetAddr::IsValid() const