Use the correct map-literal syntax.

Author: tabatkins

css-typed-om/Overview.bs

@@ -772,15 +772,15 @@ The following are the arithmetic operations you can perform on dimensions:
         Here are a few examples of CSS values,
         and their equivalent [=sum values=]:
 
-        * ''1px'' becomes `«(1, «"px"→1»)»`
-        * ''calc(1px + 1in)'' becomes `«(97, «"px"→1»)»`
+        * ''1px'' becomes `«(1, «["px" → 1]»)»`
+        * ''calc(1px + 1in)'' becomes `«(97, «["px" → 1]»)»`
             (because ''in'' and ''px'' are [=compatible units=],
             and ''px'' is the [=canonical unit=] for them)
-        * ''calc(1px + 2em)'' becomes `«(1, «"px"→1»), (2, «"em"→»1)»`
-        * ''calc(1px * 2em)'' becomes `«(2, «"em"→1, "px"→1»)»`
+        * ''calc(1px + 2em)'' becomes `«(1, «["px" → 1]»), (2, «["em" → 1]»)»`
+        * ''calc(1px * 2em)'' becomes `«(2, «["em" → 1, "px" → 1]»)»`
         * ''calc(1px + 1deg)'' can't be represented as a [=sum value=]
             because it's an invalid computation
-        * ''calc(1px * 1deg)'' becomes `«(2, «"deg"→1, "px"→1»)»`
+        * ''calc(1px * 1deg)'' becomes `«(2, «["deg" → 1, "px" → 1]»)»`
     </div>
 
     To <dfn lt="create a sum value|creating a sum value">create a sum value</dfn> from a {{CSSNumericValue}} |this|,
@@ -798,7 +798,7 @@ The following are the arithmetic operations you can perform on dimensions:
                     and change |unit| to the [=canonical unit=].
                 3. If |unit| is `"number"`,
                     return «(|value|, «»)».
-                3. Otherwise, return <code>«(|value|, «|unit|→1»)»</code>.
+                3. Otherwise, return <code>«(|value|, «[|unit| → 1]»)»</code>.
             </div>
 
         : {{CSSMathSum}}
@@ -848,7 +848,7 @@ The following are the arithmetic operations you can perform on dimensions:
         : {{CSSMathProduct}}
         ::
             <div algorithm="sum value from CSSMathProduct">
-                1. Let |values| initially be the [=sum value=] «(1, «»)».
+                1. Let |values| initially be the [=sum value=] «(1, «[ ]»)».
                     (I.e. what you'd get from ''1''.)
 
                 2. [=list/For each=] |item| in |this|’s {{CSSMathProduct/values}} internal slot: