Further tweaks to doc/index.md

Author: petrochenkov

src/doc/index.md

@@ -20,12 +20,12 @@ series of small examples.
 
 [rbe]: http://rustbyexample.com/
 
-# Specification
+# Language Reference
 
-Rust does not have an exact specification, but an effort to describe as much of
+Rust does not have an exact specification yet, but an effort to describe as much of
 the language in as much detail as possible is in [the reference](reference.html).
 
-# The Standard Library
+# Standard Library Reference
 
 We have [API documentation for the entire standard
 library](std/index.html). There's a list of crates on the left with more
@@ -34,13 +34,15 @@ something if you know its name.
 
 # Tools
 
-Rust is still a young language, so there isn't a ton of tooling yet, but the
-tools we have are really nice.
+[Cargo](https://crates.io) is the Rust's package manager providing access to libraries
+beyond the standard one, and its website contains lots of good documentation.
 
-[Cargo](https://crates.io) is Rust's package manager, and its website contains
-lots of good documentation.
+[`rustdoc`](book/documentation.html) is the Rust's documentation generator, a tool converting
+annotated source code into HTML docs.
 
-[`rustdoc`](book/documentation.html) is used to generate documentation for Rust code.
+A bunch of non-official tools are available, such as [Racer](https://github.com/phildawes/racer)
+(code completion engine), or [rustfmt](https://github.com/nrc/rustfmt) (source code formatter),
+or text editor plugins.
 
 # Community & Getting Help