Minor grammatical fixes and removed section on 'rust' tool

Author: mletterle

doc/rust.md

@@ -3168,7 +3168,7 @@ Raw pointers (`*`)
   : Raw pointers are pointers without safety or liveness guarantees.
     Raw pointers are written `*content`,
     for example `*int` means a raw pointer to an integer.
-    Copying or dropping a raw pointer is has no effect on the lifecycle of any other value.
+    Copying or dropping a raw pointer has no effect on the lifecycle of any other value.
     Dereferencing a raw pointer or converting it to any other pointer type is an [`unsafe` operation](#unsafe-functions).
     Raw pointers are generally discouraged in Rust code;
     they exist to support interoperability with foreign code,

doc/tutorial.md

@@ -151,22 +151,6 @@ declaration to appear at the top level of the file: all statements must
 live inside a function.  Rust programs can also be compiled as
 libraries, and included in other programs.
 
-## Using the rust tool
-
-While using `rustc` directly to generate your executables, and then
-running them manually is a perfectly valid way to test your code,
-for smaller projects, prototypes, or if you're a beginner, it might be
-more convenient to use the `rust` tool.
-
-The `rust` tool provides central access to the other rust tools,
-as well as handy shortcuts for directly running source files.
-For example, if you have a file `foo.rs` in your current directory,
-`rust run foo.rs` would attempt to compile it and, if successful,
-directly run the resulting binary.
-
-To get a list of all available commands, simply call `rust` without any
-argument.
-
 ## Editing Rust code
 
 There are vim highlighting and indentation scripts in the Rust source

src/libstd/rt/io/mod.rs

@@ -12,8 +12,8 @@
 
 This module defines the Rust interface for synchronous I/O.
 It models byte-oriented input and output with the Reader and Writer traits.
-Types that implement both `Reader` and `Writer` and called 'streams',
-and automatically implement trait `Stream`.
+Types that implement both `Reader` and `Writer` are called 'streams',
+and automatically implement the `Stream` trait.
 Implementations are provided for common I/O streams like
 file, TCP, UDP, Unix domain sockets.
 Readers and Writers may be composed to add capabilities like string