Minor spelling/grammar/usage fixes.

Note: "different to" is not exactly incorrect, but "different from" is more
commonly accepted in both US and Commonwealth English, and also more
consistent with other usage within this tutorial.

Author: mbrubeck

src/doc/tutorial.md

@@ -2841,11 +2841,11 @@ use farm::cow;
 
 The path you give to `use` is per default global, meaning relative to the crate root,
 no matter how deep the module hierarchy is, or whether the module body it's written in
-is contained in its own file (remember: files are irrelevant).
+is contained in its own file. (Remember: files are irrelevant.)
 
-This is different to other languages, where you often only find a single import construct that combines the semantic
+This is different from other languages, where you often only find a single import construct that combines the semantic
 of `mod foo;` and `use`-statements, and which tend to work relative to the source file or use an absolute file path
-- Rubys `require` or C/C++'s `#include` come to mind.
+- Ruby's `require` or C/C++'s `#include` come to mind.
 
 However, it's also possible to import things relative to the module of the `use`-statement:
 Adding a `super::` in front of the path will start in the parent module,
@@ -3025,7 +3025,7 @@ The nested `barn` module is private, but the `pub use` allows users
 of the module `farm` to access a function from `barn` without needing
 to know that `barn` exists.
 
-In other words, you can use them to decouple an public api from their internal implementation.
+In other words, you can use it to decouple a public api from its internal implementation.
 
 ## Using libraries