message: Fix a couple minor typos in codegen.proto
diff: @@ -251,9 +251,9 @@ message LocatePass {
  required stripe.proto.Location loc = 3;
  }
  -// The stencil pass attempts to rewrite block to contain an inner block that
  +// The stencil pass attempts to rewrite blocks to contain an inner block that
  // matches a fixed hardware 'Stencil' or set of stencils. Basically, we presume
  -// that the hardware has one or more build in 'indexes' (which may exist over
  +// that the hardware has one or more built-in 'indexes' (which may exist over
  // time or actual be parallel hardware). We then try to match indexes or
  // regions of indexes of a block to the various hardware indexes, and rewrite
  // the block into an outer block that make multiple calls to a fixed, hardware
  