Doc fix: Update Cargo.toml in book/getting-started

The Cargo.toml mentioned in book/getting-started
is missing the section called `[dependencies]`

Author: deepak

src/doc/book/getting-started.md

@@ -575,8 +575,12 @@ look something like this:
 name = "hello_world"
 version = "0.1.0"
 authors = ["Your Name <you@example.com>"]
+
+[dependencies]
 ```
 
+Do not worry about the `[dependencies]` line, we will come back to it later.
+
 Cargo has populated *Cargo.toml* with reasonable defaults based on the arguments
 you gave it and your `git` global configuration. You may notice that Cargo has
 also initialized the `hello_world` directory as a `git` repository.