[js-api][web-api] Fix some markup errors.

Author: Ms2ger

document/js-api/index.bs

@@ -651,7 +651,7 @@ which can be simultaneously referenced by multiple {{Instance}} objects. Each
 <div algorithm>
     The <dfn constructor for="Memory">Memory(|descriptor|)</dfn> constructor, when invoked, performs the following steps:
     1. Let |initial| be |descriptor|["initial"].
-    1. If |descriptor|["maximum"] is [=present=], let |maximum| be |descriptor|["maximum"]; otherwise, let |maximum| be empty.
+    1. If |descriptor|["maximum"] [=map/exists=], let |maximum| be |descriptor|["maximum"]; otherwise, let |maximum| be empty.
     1. If |maximum| is not empty and |maximum| &lt; |initial|, throw a {{RangeError}} exception.
     1. Let |memtype| be { min |initial|, max |maximum| }.
     1. Let |store| be the [=surrounding agent=]'s [=associated store=].
@@ -747,7 +747,7 @@ Each {{Table}} object has a \[[Table]] internal slot, which is a [=table address
 <div algorithm>
     The <dfn constructor for="Table">Table(|descriptor|)</dfn> constructor, when invoked, performs the following steps:
     1. Let |initial| be |descriptor|["initial"].
-    1. If |descriptor|["maximum"] is [=present=], let |maximum| be |descriptor|["maximum"]; otherwise, let |maximum| be empty.
+    1. If |descriptor|["maximum"] [=map/exists=], let |maximum| be |descriptor|["maximum"]; otherwise, let |maximum| be empty.
     1. If |maximum| is not empty and |maximum| &lt; |initial|, throw a {{RangeError}} exception.
     1. Let |type| be the [=table type=] {[=table type|𝗆𝗂𝗇=] |initial|, [=table type|𝗆𝖺𝗑=] |maximum|} [=table type|𝖺𝗇𝗒𝖿𝗎𝗇𝖼=].
     1. Let |store| be the [=surrounding agent=]'s [=associated store=].
@@ -985,7 +985,7 @@ This slot holds a [=function address=] relative to the [=surrounding agent=]'s [
     1. Otherwise, if |outArity| is 1, return [=ToJSValue=](|v|), where |v| is the singular element of |ret|.
     1. Otherwise,
         1. Let |values| be a new, empty [=list=].
-        1. For each |r| in |ret|, [=append=] [=ToJSValue=](|r|) to |values|.
+        1. For each |r| in |ret|, [=list/append=] [=ToJSValue=](|r|) to |values|.
         1. Return [=CreateArrayFromList=](|values|).
 </div>
 

document/web-api/index.bs

@@ -273,7 +273,7 @@ application/wasm
  <dd>None</dd>
 </dl></dd>
 <dt>Person & email address to contact for further information:</dt>
- <dd>Eric Prud'hommeaux <[email protected]></dd>
+ <dd>Eric Prud'hommeaux &lt;[email protected]></dd>
 <dt>Intended usage:</dt>
  <dd>Common</dd>
 <dt>Restrictions on usage:</dt>