Small corrections to docs

Author: pvdrz

src/helpers.rs

@@ -346,14 +346,14 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriEvalContextExt<'mir, 'tcx
         Ok(())
     }
 
-    /// Sets the last error variable
+    /// Sets the last error variable.
     fn set_last_error(&mut self, scalar: Scalar<Tag>) -> InterpResult<'tcx> {
         let this = self.eval_context_mut();
         let errno_place = this.machine.last_error.unwrap();
         this.write_scalar(scalar, errno_place.into())
     }
 
-    /// Gets the last error variable
+    /// Gets the last error variable.
     fn get_last_error(&mut self) -> InterpResult<'tcx, Scalar<Tag>> {
         let this = self.eval_context_mut();
         let errno_place = this.machine.last_error.unwrap();

src/machine.rs

@@ -91,7 +91,7 @@ pub struct Evaluator<'tcx> {
     pub(crate) argv: Option<Pointer<Tag>>,
     pub(crate) cmd_line: Option<Pointer<Tag>>,
 
-    /// Last OS error location in memory. It is a 32 bit integer (unsigned for Windows)
+    /// Last OS error location in memory. It is a 32-bit integer
     pub(crate) last_error: Option<MPlaceTy<'tcx, Tag>>,
 
     /// TLS state.