[css-color] remove commas between in the color() examples

Author: svgeesus

css-color/Overview.bs

@@ -196,7 +196,7 @@ The RGB functions: ''rgb()'' and ''rgba()''</h3>
 	but are clamped to the device's gamut.)
 
 	<p class="issue">The transfer function is undefined outside the range 0% to 100%.</p>
-	
+
 
 	The final argument, the <<alpha-value>>, specifies the alpha of the color.
 	If given as a <<number>>, the useful range of the value is ''0''
@@ -1534,26 +1534,32 @@ Device-independent Colors: Lab and LCH</h2>
 	CSS allows colors to be directly expressed in Lab and LCH. 
 
 	<pre class='prod'>
-	<dfn>lab()</dfn> = lab( <<number>> , <<number>> , <<number>> )
+	<dfn>lab()</dfn> = lab( <<number>>  <<number>>  <<number>>  [, <<alpha-value>>]?)
 	</pre>
 
 	The first argument specifies the CIE Lightness, the second argument is a and the third is b.
 	L is constrained to the range [0, 100] while a and b are signed values and 
-	theoretically unbounded (but in practice do not exceed ±160).
+	theoretically unbounded (but in practice do not exceed ±160). 
+	There is an optional fourth alpha value, separated by a comma.
 
 	<pre class='prod'>
-	<dfn>lch()</dfn> = lch( <<number>> , <<number>> , <<number>> )
+	<dfn>lch()</dfn> = lch( <<number>>  <<number>>  <<number>> [, <<alpha-value>>]?)
 	</pre>
 
 	The first argument specifies the CIE Lightness, the second argument is C and the third is H.
 	L is constrained to the range [0, 100]. C is an unsigned number, theoretically unbounded 
 	(but in practice does not exceed 230).
 	 H is constrained to the range [0, 360).
+	 	There is an optional fourth alpha value, separated by a comma.
+
 
 		<p class="issue">Need to define handling for out of range numbers. 
 			Clip L, wrap H? Have also seen L up to 400, specifically 
 			 for high dynamic range situations.</p>
 
+			<p class="issue">Need to decide what, if anything, to do 
+			for high dynamic range on luminance.</p>
+
 <h3 id='rgb-to-lab'>
 Converting sRGB colors to Lab colors</h3>
 
@@ -1610,7 +1616,7 @@ Converting LCH colors to Lab  colors</h3>
 <h2 id='grays'>
 Specifying Grays: the ''gray()'' functional notation</h2>
 
-<!-- As decided at San Francisco, this syntax is an alias to Lab with a=b=0.  -->
+<p class="issue">As decided at San Francisco, this syntax is an alias to Lab with a=b=0.</p>
 
 	Grays are fully desaturated colors. The ''gray()'' functional notation simplifies 
 	specifying this common set of colors, so that only a single numerical parameter