Few changes to lint docs and suggestion message

Author: pmk21

clippy_lints/src/implicit_saturating_sub.rs

@@ -16,10 +16,10 @@ declare_clippy_lint! {
     /// **Example:**
     ///
     /// ```rust
-    /// let end = 10;
-    /// let start = 5;
+    /// let end: u32 = 10;
+    /// let start: u32 = 5;
     ///
-    /// let mut i = end - start;
+    /// let mut i: u32 = end - start;
     ///
     /// // Bad
     /// if i != 0 {
@@ -28,13 +28,13 @@ declare_clippy_lint! {
     /// ```
     /// Use instead:
     /// ```rust
-    /// let end = 10;
-    /// let start = 5;
+    /// let end: u32 = 10;
+    /// let start: u32 = 5;
     ///
-    /// let mut i = end - start;
+    /// let mut i: u32 = end - start;
     ///
     /// // Good
-    /// i.saturating_sub(1);
+    /// i = i.saturating_sub(1);
     /// ```
     pub IMPLICIT_SATURATING_SUB,
     pedantic,
@@ -81,7 +81,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for ImplicitSaturatingSub {
                     expr.span,
                     "Implicitly performing saturating subtraction",
                     "try",
-                    format!("{}.saturating_sub({});", var_name, assign_lit.to_string()),
+                    format!("{} = {}.saturating_sub({});", var_name, var_name, assign_lit.to_string()),
                     applicability
                 );
             }