Rephrase to be more normative.

Author: winks

FORMATTING.md

@@ -1,16 +1,20 @@
 # Formatting rules
 
-1. The format of this document is [Markdown](http://daringfireball.net/projects/markdown/)
+1. The format of the PHP Language Specification is
+   [Markdown](http://daringfireball.net/projects/markdown/).
 2. Everything in the actual specification document must be ASCII only.
 3. The only allowed extensions to original Markdown are tables and code blocks
    (indicated by three backticks).
 4. Style
   * Use spaces to indent, not tabs.
-  * Use of prefixed `##` is preferred for headers over underlined `===`
+  * For headings, use prefixed hash symbols `# Example`, not underlining it
+    with `===`.
   * Use of *inline* links `[example](http://example.org)` is preferred over
-    *reference* links `[example][xmpl]` unless used multiple times. This is to
-    allow for easier splitting and reorganization.
-  * Do not embed external images not hosted on php.net.
+    *reference* links `[example][xmpl]` unless used multiple times in a
+    paragraph or section. This is to allow for easier splitting and
+    reorganization of the document.
+  * Do not embed external images not hosted on [php.net](http://php.net)
+    infrastructure.
   * Try to stick to 80 chars wide, if possible. This is not as strict as
-    in code, but still easier to read most of the times. This does only apply
-    to text, not to code examples or tables.
+    in coding standard rules, but still easier to read most of the times.
+    This does only apply to text, not to code examples or tables.