Reflect the changes in rust-lang/rust#67000

Signed-off-by: Yuki Okushi <jtitor@2k36.org>

Author: JohnTitor

src/mir/index.md

@@ -217,7 +217,7 @@ over the overflow checks.)
 ## MIR data types
 
 The MIR data types are defined in the [`compiler/rustc_middle/src/mir/`][mir]
-module.  Each of the key concepts mentioned in the previous section
+module. Each of the key concepts mentioned in the previous section
 maps in a fairly straightforward way to a Rust type.
 
 The main MIR data type is [`Body`]. It contains the data for a single
@@ -235,10 +235,9 @@ but [you can read about those below](#promoted)).
   The data for a local variable is found in the
   [`Body::local_decls`][localdecls] vector). There is also a special constant
   [`RETURN_PLACE`] identifying the special "local" representing the return value.
-- **Places** are identified by the enum [`Place`]. There are a few
-  variants:
+- **Places** are identified by the struct [`Place`]. There are a few
+  fields:
   - Local variables like `_1`
-  - Static variables `FOO`
   - **Projections**, which are fields or other things that "project
     out" from a base place. These are represented by the type
     [`ProjectionElem`].  So e.g. the place `_1.f` is a projection,