make text more easy to read

Author: tshepang

src/doc/rustc/src/platform-support/wasm32-unknown-unknown.md

@@ -29,10 +29,10 @@ that not all uses of `wasm32-unknown-unknown` are using JavaScript and the web.
 
 ## Target maintainers
 
-When this target was added to the compiler platform-specific documentation here
+When this target was added to the compiler, platform-specific documentation here
 was not maintained at that time. This means that the list below is not
-exhaustive and there are more interested parties in this target. That being
-said since when this document was last updated those interested in maintaining
+exhaustive, and there are more interested parties in this target. That being
+said, when this document was last updated, those interested in maintaining
 this target are:
 
 - Alex Crichton, https://github.com/alexcrichton