Update ql-style-guide.md

Our [QLDoc style guide](https://github.com/github/codeql/blob/main/docs/qldoc-style-guide.md#predicates-with-result) says that we should avoid any use of `return`, so it would be smart to also do so in our own style guide for predicate names 😊

docs/ql-style-guide.md

@@ -176,7 +176,7 @@ private predicate foo(Expr e, Expr p) {
 1. Acronyms *should* use normal PascalCase/camelCase. However, two-letter acronyms should have both letters capitalized.
 1. Newtype predicate names *should* begin with `T`.
 1. Predicates that have a result *should* be named `get...`
-1. Predicates that can return multiple results *should* be named `getA...` or `getAn...`
+1. Predicates that can have multiple results *should* be named `getA...` or `getAn...`
 1. Predicates that don't have a result or parameters *should* be named `is...` or `has...`
 1. *Avoid* underscores in names.
 1. *Avoid* short or single-letter names for classes, predicates and fields.
@@ -304,6 +304,7 @@ For more information about documenting the code that you contribute to this repo
   exists(Type arg | arg = this.getAChild() | arg instanceof TypeParameter)
 ```
 
+
 ```ql
   exists(Type qualifierType |
     this.hasNonExactQualifierType(qualifierType)