build(aio): fix up API doc-gen templates

* Remove whitespace before type specifiers
* Generate `new` and `call` member info for interfaces
* Ensure that there is no double space after class names

aio/tools/transforms/templates/api/lib/paramList.html

@@ -8,5 +8,5 @@
 
 
 {% macro returnType(returnType) -%}
-  {%- if returnType %} : {$ returnType | escape $}{% endif -%}
+  {%- if returnType %}: {$ returnType | escape $}{% endif -%}
 {%- endmacro -%}