[css-color-5] Fix markup

Typos from #11652.

Author: cdoublev

css-color-5/Overview.bs

@@ -2647,7 +2647,7 @@ or any other color or monochrome output device which has been characterized.
 
 	<pre class='prod'>
 		<dfn export>&lt;color-space></dfn> = <<rectangular-color-space>> | <<polar-color-space>> | <<custom-color-space>>
-		<dfn export>&lt;rectangular-color-space></dfn> = <l>''srgb''</l> | <l>''srgb-linear''</l> | <l>''display-p3''</l> | <l>''a98-rgb''</l> | <l>''prophoto-rgb''</l> | <l>''rec2020''</l> | <l>''lab''</l> | <l>''oklab''</l> | <l>''xyz'' | ''xyz-d50'' | ''xyz-d65''</l>
+		<dfn export>&lt;rectangular-color-space></dfn> = <l>''srgb''</l> | <l>''srgb-linear''</l> | <l>''display-p3''</l> | <l>''a98-rgb''</l> | <l>''prophoto-rgb''</l> | <l>''rec2020''</l> | <l>''lab''</l> | <l>''oklab''</l> | <l>''xyz''</l> | <l>''xyz-d50''</l> | <l>''xyz-d65''</l>
 		<dfn export>&lt;polar-color-space></dfn> = <l>''hsl''</l> | <l>''hwb''</l> | <l>''lch''</l> | <l>''oklch''</l>
 		<dfn export>&lt;custom-color-space></dfn> = <<dashed-ident>>
 		<dfn export>&lt;hue-interpolation-method></dfn> = [ shorter | longer | increasing | decreasing ] hue

css-easing-2/Overview.bs

@@ -781,7 +781,7 @@ It is defined by a number of <dfn for=steps()>steps</dfn>, and a <dfn for=steps(
 It has the following syntax:
 
 <pre class="prod">
-  <dfn>&lt;step-easing-function></dfn> = ''step-start'' | ''step-end'' | <<steps()>>
+  <dfn>&lt;step-easing-function></dfn> = <l>''step-start''</l> | <l>''step-end''</l> | <<steps()>>
 
   <dfn>steps()</dfn> = steps( <<integer>>, <<step-position>>?)
   <dfn type>&lt;step-position></dfn> = <l>''jump-start''</l> | <l>''jump-end''</l> | <l>''jump-none''</l> | <l>''jump-both''</l>