double-comparisons: make lint adhere to lint message convention

Author: matthiaskrgr

clippy_lints/src/double_comparison.rs

@@ -60,7 +60,7 @@ impl<'tcx> DoubleComparisons {
                     cx,
                     DOUBLE_COMPARISONS,
                     span,
-                    "This binary expression can be simplified",
+                    "this binary expression can be simplified",
                     "try",
                     sugg,
                     applicability,

tests/ui/double_comparison.stderr

@@ -1,48 +1,48 @@
-error: This binary expression can be simplified
+error: this binary expression can be simplified
   --> $DIR/double_comparison.rs:6:8
    |
 LL |     if x == y || x < y {
    |        ^^^^^^^^^^^^^^^ help: try: `x <= y`
    |
    = note: `-D clippy::double-comparisons` implied by `-D warnings`
 
-error: This binary expression can be simplified
+error: this binary expression can be simplified
   --> $DIR/double_comparison.rs:9:8
    |
 LL |     if x < y || x == y {
    |        ^^^^^^^^^^^^^^^ help: try: `x <= y`
 
-error: This binary expression can be simplified
+error: this binary expression can be simplified
   --> $DIR/double_comparison.rs:12:8
    |
 LL |     if x == y || x > y {
    |        ^^^^^^^^^^^^^^^ help: try: `x >= y`
 
-error: This binary expression can be simplified
+error: this binary expression can be simplified
   --> $DIR/double_comparison.rs:15:8
    |
 LL |     if x > y || x == y {
    |        ^^^^^^^^^^^^^^^ help: try: `x >= y`
 
-error: This binary expression can be simplified
+error: this binary expression can be simplified
   --> $DIR/double_comparison.rs:18:8
    |
 LL |     if x < y || x > y {
    |        ^^^^^^^^^^^^^^ help: try: `x != y`
 
-error: This binary expression can be simplified
+error: this binary expression can be simplified
   --> $DIR/double_comparison.rs:21:8
    |
 LL |     if x > y || x < y {
    |        ^^^^^^^^^^^^^^ help: try: `x != y`
 
-error: This binary expression can be simplified
+error: this binary expression can be simplified
   --> $DIR/double_comparison.rs:24:8
    |
 LL |     if x <= y && x >= y {
    |        ^^^^^^^^^^^^^^^^ help: try: `x == y`
 
-error: This binary expression can be simplified
+error: this binary expression can be simplified
   --> $DIR/double_comparison.rs:27:8
    |
 LL |     if x >= y && x <= y {