Bring attention to suggestions when the only difference is capitalization

src/test/ui/issues/issue-10200.stderr

@@ -2,7 +2,7 @@ error[E0532]: expected tuple struct/variant, found function `foo`
   --> $DIR/issue-10200.rs:6:9
    |
 LL |         foo(x)
-   |         ^^^ help: a tuple struct with a similar name exists: `Foo`
+   |         ^^^ help: a tuple struct with a similar name exists (notice the capitalization): `Foo`
 
 error: aborting due to previous error
 

src/test/ui/issues/issue-17546.stderr

@@ -27,7 +27,7 @@ LL |     use std::prelude::v1::Result;
    |
 LL |     use std::result::Result;
    |
-and 1 other candidates
+     and 1 other candidates
 
 error[E0573]: expected type, found variant `Result`
   --> $DIR/issue-17546.rs:28:13
@@ -44,7 +44,7 @@ LL | use std::prelude::v1::Result;
    |
 LL | use std::result::Result;
    |
-and 1 other candidates
+     and 1 other candidates
 
 error[E0573]: expected type, found variant `NoResult`
   --> $DIR/issue-17546.rs:33:15

src/test/ui/issues/issue-17718-const-naming.stderr

@@ -15,7 +15,7 @@ error: constant `foo` should have an upper case name
   --> $DIR/issue-17718-const-naming.rs:4:7
    |
 LL | const foo: isize = 3;
-   |       ^^^ help: convert the identifier to upper case: `FOO`
+   |       ^^^ help: convert the identifier to upper case (notice the capitalization): `FOO`
    |
 note: lint level defined here
   --> $DIR/issue-17718-const-naming.rs:2:9

src/test/ui/issues/issue-46332.stderr

@@ -2,7 +2,7 @@ error[E0422]: cannot find struct, variant or union type `TyUInt` in this scope
   --> $DIR/issue-46332.rs:9:5
    |
 LL |     TyUInt {};
-   |     ^^^^^^ help: a struct with a similar name exists: `TyUint`
+   |     ^^^^^^ help: a struct with a similar name exists (notice the capitalization): `TyUint`
 
 error: aborting due to previous error