Remove ambiguities in SVG transform syntax

Fixes #4455

Spacing between consecutive numbers should not be optional

Author: mclegrand

css-transforms-1/Overview.bs

@@ -585,7 +585,7 @@ Note: The syntax reflects implemented behavior in user agents and differs from t
     </pre>
   </dd>
   <dt id="svg-translate">translate</dt>
-  <dd><pre>"translate" wsp* "(" wsp* number ( comma-wsp? number )? wsp* ")"</pre></dd>
+  <dd><pre>"translate" wsp* "(" wsp* number ( comma-wsp number )? wsp* ")"</pre></dd>
   <dd>
     <pre class='railroad'>
     Stack:
@@ -610,7 +610,7 @@ Note: The syntax reflects implemented behavior in user agents and differs from t
     </pre>
   </dd>
   <dt id="svg-scale">scale</dt>
-  <dd><pre>"scale" wsp* "(" wsp* number ( comma-wsp? number )? wsp* ")"</pre></dd>
+  <dd><pre>"scale" wsp* "(" wsp* number ( comma-wsp number )? wsp* ")"</pre></dd>
   <dd>
     <pre class='railroad'>
     Stack:
@@ -635,7 +635,7 @@ Note: The syntax reflects implemented behavior in user agents and differs from t
     </pre>
   </dd>
   <dt id="svg-rotate">rotate</dt>
-  <dd><pre>"rotate" wsp* "(" wsp* number ( comma-wsp? number comma-wsp? number )? wsp* ")"</pre></dd>
+  <dd><pre>"rotate" wsp* "(" wsp* number ( comma-wsp number comma-wsp number )? wsp* ")"</pre></dd>
   <dd>
     <pre class='railroad'>
     Stack:
@@ -704,11 +704,11 @@ Note: The syntax reflects implemented behavior in user agents and differs from t
   <dt id="svg-matrix">matrix</dt>
   <dd><pre>
 "matrix" wsp* "(" wsp*
-    number comma-wsp?
-    number comma-wsp?
-    number comma-wsp?
-    number comma-wsp?
-    number comma-wsp?
+    number comma-wsp
+    number comma-wsp
+    number comma-wsp
+    number comma-wsp
+    number comma-wsp
     number wsp* ")"
   </pre></dd>
   <dd>