Fix some typos

Author: Eijebong

src/bootstrap/builder.rs

@@ -333,7 +333,7 @@ impl<'a> Builder<'a> {
         StepDescription::run(&Builder::get_step_descriptions(Kind::Doc), self, paths);
     }
 
-    /// Obtain a compiler at a given stage and for a given host. Explictly does
+    /// Obtain a compiler at a given stage and for a given host. Explicitly does
     /// not take `Compiler` since all `Compiler` instances are meant to be
     /// obtained through this function, since it ensures that they are valid
     /// (i.e., built and assembled).
@@ -501,7 +501,7 @@ impl<'a> Builder<'a> {
             // crates). Let's say, for example that rustc itself depends on the
             // bitflags crate. If an external crate then depends on the
             // bitflags crate as well, we need to make sure they don't
-            // conflict, even if they pick the same verison of bitflags. We'll
+            // conflict, even if they pick the same version of bitflags. We'll
             // want to make sure that e.g. a plugin and rustc each get their
             // own copy of bitflags.
 

src/bootstrap/doc.rs

@@ -306,7 +306,7 @@ impl Step for Standalone {
     ///
     /// This will list all of `src/doc` looking for markdown files and appropriately
     /// perform transformations like substituting `VERSION`, `SHORT_HASH`, and
-    /// `STAMP` alongw ith providing the various header/footer HTML we've cutomized.
+    /// `STAMP` along with providing the various header/footer HTML we've customized.
     ///
     /// In the end, this is just a glorified wrapper around rustdoc!
     fn run(self, builder: &Builder) {