"and has" → "because it has"

Author: zackmdavis

src/diag.md

@@ -148,8 +148,9 @@ For more information about this error, try `rustc --explain E0999`.
 There are a few other [`Applicability`][appl] possibilities:
 
 - `MachineApplicable`: Can be applied mechanically.
-- `HasPlaceholders`: Cannot be applied mechanically and has placeholder text in
-  the suggestions. For example, "Try adding a type: \`let x: \<type\>\`".
+- `HasPlaceholders`: Cannot be applied mechanically because it has placeholder
+  text in the suggestions. For example, "Try adding a type: \`let x:
+  \<type\>\`".
 - `MaybeIncorrect`: Cannot be applied mechanically because the suggestion may
   or may not be a good one.
 - `Unspecified`: Cannot be applied mechanically because we don't know which