Integrate crlf directly into related test file instead via of .gitattributes

tests/rustdoc-ui/intra-doc/.gitattributes

@@ -1 +1 @@
-warning-crlf.rs eol=crlf
+warning-crlf.rs -text

tests/rustdoc-ui/intra-doc/warning-crlf.rs

@@ -1,26 +1,26 @@
-// ignore-tidy-cr
-//@ check-pass
-
-// This file checks the spans of intra-link warnings in a file with CRLF line endings. The
-// .gitattributes file in this directory should enforce it.
-
-/// [error]
-pub struct A;
-//~^^ WARNING `error`
-
-///
-/// docs [error1]
-//~^ WARNING `error1`
-
-/// docs [error2]
-///
-pub struct B;
-//~^^^ WARNING `error2`
-
-/**
- * This is a multi-line comment.
- *
- * It also has an [error].
- */
-pub struct C;
-//~^^^ WARNING `error`
+// ignore-tidy-cr
+//@ check-pass
+
+// This file checks the spans of intra-link warnings in a file with CRLF line endings. The
+// .gitattributes file in this directory should enforce it.
+
+/// [error]
+pub struct A;
+//~^^ WARNING `error`
+
+///
+/// docs [error1]
+//~^ WARNING `error1`
+
+/// docs [error2]
+///
+pub struct B;
+//~^^^ WARNING `error2`
+
+/**
+ * This is a multi-line comment.
+ *
+ * It also has an [error].
+ */
+pub struct C;
+//~^^^ WARNING `error`