docs/CODING_STYLE: document that we nowadays prefer (const char*) for func ret type

Addresses https://github.com/systemd/systemd/pull/33567#discussion_r1662818225

(cherry picked from commit 4b7249111a4c1d366f476bdbd6e03f7893eb9d42)
(cherry picked from commit 3c91ea49d249cda6e1fa84b53a42dee6d83339da)
(cherry picked from commit b8d993f0292f25cddbc284acb4ddc513cf0d1f3b)
(cherry picked from commit 661fa2d832baffd03f0adbb749f1a8a3bbae1979)

docs/CODING_STYLE.md

@@ -54,6 +54,18 @@ SPDX-License-Identifier: LGPL-2.1-or-later
   }
   ```
 
+- Function return types should be seen/written as whole, i.e. write this:
+
+  ```c
+  const char* foo(const char *input);
+  ```
+
+  instead of this:
+
+  ```c
+  const char *foo(const char *input);
+  ```
+
 - Single-line `if` blocks should not be enclosed in `{}`. Write this:
 
   ```c
@@ -179,7 +191,7 @@ SPDX-License-Identifier: LGPL-2.1-or-later
 
   ```c
   static int foobar_frobnicate(
-                  Foobar* object,            /* the associated mutable object */
+                  Foobar *object,            /* the associated mutable object */
                   const char *input,         /* immutable input parameter */
                   char **ret_frobnicated) {  /* return parameter */
           …