Fix getter name for maplike/setlike size

Author: domenic

index.bs

@@ -12754,7 +12754,7 @@ with the following characteristics:
 
     The value of the [=function object=]'s <code class="idl">length</code> property is the Number value <emu-val>0</emu-val>.
 
-    The value of the [=function object=]'s <code class="idl">name</code> property is the String value "<code>size</code>".
+    The value of the [=function object=]'s <code class="idl">name</code> property is the String value "<code>get size</code>".
 
 
 <h5 id="es-map-iterator" oldids="es-iterator, es-iterators">@@iterator</h5>
@@ -13064,7 +13064,7 @@ with the following characteristics:
 
     The value of the [=function object=]'s <code class="idl">length</code> property is the Number value <emu-val>0</emu-val>.
 
-    The value of the [=function object=]'s <code class="idl">name</code> property is the String value "<code>size</code>".
+    The value of the [=function object=]'s <code class="idl">name</code> property is the String value "<code>get size</code>".
 
 
 <h5 id="es-set-iterator">@@iterator</h5>