Limit test sensitivity to macro pretty printing output

See rust-lang/rust#65207.

Author: busgaidw2

testing/templates/rust-macro-args.html

@@ -1,26 +1,15 @@
 {{
         call_a_or_b_on_tail!(
-            (a: compute_len, b: zero),
-                the recursive part that skips over all these
-                tokens doesn't much care whether we will call a
-                or call b: only the terminal rules care.
+            (a: compute_len, b: zero), call b: only the terminal rules care.
         )
 }}
 {{
         call_a_or_b_on_tail!(
-            (a: compute_len, b: zero),
-                and now, to justify the existence of two paths
-                we will also call a: its input should somehow
-                be self-referential, so let's make it return
-                some ninety one!
+            (a: compute_len, b: zero), call a: some ninety one!
         )
 }}
 {{
         call_a_or_b_on_tail!(
-            (a: compute_len, b: zero),
-                and now, to justify the existence of two paths
-                we will also call a: its input should somehow
-                be self-referential, so let's make it return
-                some ninety "(\"()"nine!
+            (a: compute_len, b: zero), call a: some ninety "(\"()"nine!
         )
 }}

testing/tests/rust_macro.rs

@@ -45,5 +45,5 @@ struct RustMacrosArgTemplate {}
 #[test]
 fn args() {
     let template = RustMacrosArgTemplate {};
-    assert_eq!("0\n91\n99", template.render().unwrap());
+    assert_eq!("0\n17\n25", template.render().unwrap());
 }