doc: fix a couple of drive-by review comments in FAQ

Change-Id: I10cc2073e28cefb1b9a10c0ae89d819ad6417d66
Reviewed-on: https://go-review.googlesource.com/125695Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

doc/go_faq.html

@@ -2419,12 +2419,12 @@ simpler because they don't need to specify how memory is managed across them.
 
 <p>
 This is not to say that the recent work in languages
-like Rust that bring new ideas to the problem of to managing
+like Rust that bring new ideas to the problem of managing
 resources is misguided; we encourage this work and are excited to see
 how it evolves.
 But Go takes a more traditional approach by addressing
 object lifetimes through
-garbage collection, and garbage collection only.
+garbage collection, and garbage collection alone.
 </p>
 
 <p>