neg-cmp-op-on-partial-ord: make lint adhere to lint message convention

Author: matthiaskrgr

clippy_lints/src/neg_cmp_op_on_partial_ord.rs

@@ -79,7 +79,7 @@ impl<'tcx> LateLintPass<'tcx> for NoNegCompOpForPartialOrd {
                         cx,
                         NEG_CMP_OP_ON_PARTIAL_ORD,
                         expr.span,
-                        "The use of negated comparison operators on partially ordered \
+                        "the use of negated comparison operators on partially ordered \
                         types produces code that is hard to read and refactor. Please \
                         consider using the `partial_cmp` method instead, to make it \
                         clear that the two values could be incomparable."

tests/ui/neg_cmp_op_on_partial_ord.stderr

@@ -1,24 +1,24 @@
-error: The use of negated comparison operators on partially ordered types produces code that is hard to read and refactor. Please consider using the `partial_cmp` method instead, to make it clear that the two values could be incomparable.
+error: the use of negated comparison operators on partially ordered types produces code that is hard to read and refactor. Please consider using the `partial_cmp` method instead, to make it clear that the two values could be incomparable.
   --> $DIR/neg_cmp_op_on_partial_ord.rs:16:21
    |
 LL |     let _not_less = !(a_value < another_value);
    |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: `-D clippy::neg-cmp-op-on-partial-ord` implied by `-D warnings`
 
-error: The use of negated comparison operators on partially ordered types produces code that is hard to read and refactor. Please consider using the `partial_cmp` method instead, to make it clear that the two values could be incomparable.
+error: the use of negated comparison operators on partially ordered types produces code that is hard to read and refactor. Please consider using the `partial_cmp` method instead, to make it clear that the two values could be incomparable.
   --> $DIR/neg_cmp_op_on_partial_ord.rs:19:30
    |
 LL |     let _not_less_or_equal = !(a_value <= another_value);
    |                              ^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
-error: The use of negated comparison operators on partially ordered types produces code that is hard to read and refactor. Please consider using the `partial_cmp` method instead, to make it clear that the two values could be incomparable.
+error: the use of negated comparison operators on partially ordered types produces code that is hard to read and refactor. Please consider using the `partial_cmp` method instead, to make it clear that the two values could be incomparable.
   --> $DIR/neg_cmp_op_on_partial_ord.rs:22:24
    |
 LL |     let _not_greater = !(a_value > another_value);
    |                        ^^^^^^^^^^^^^^^^^^^^^^^^^^
 
-error: The use of negated comparison operators on partially ordered types produces code that is hard to read and refactor. Please consider using the `partial_cmp` method instead, to make it clear that the two values could be incomparable.
+error: the use of negated comparison operators on partially ordered types produces code that is hard to read and refactor. Please consider using the `partial_cmp` method instead, to make it clear that the two values could be incomparable.
   --> $DIR/neg_cmp_op_on_partial_ord.rs:25:33
    |
 LL |     let _not_greater_or_equal = !(a_value >= another_value);