Change camel case warning to upper camel case

Rust structs should be named in upper camel case aka PascalCase. "Upper camel case" was decided upon as the preferred phrase over PascalCase per: rust-lang/rfcs#2389

Author: tcullum-gpsw

src/test/ui/lint/lint-non-camel-case-types.stderr

@@ -1,4 +1,4 @@
-error: type `ONE_TWO_THREE` should have a camel case name such as `OneTwoThree`
+error: type `ONE_TWO_THREE` should have an upper camel case name such as `OneTwoThree`
   --> $DIR/lint-non-camel-case-types.rs:4:1
    |
 LL | struct ONE_TWO_THREE;
@@ -10,72 +10,72 @@ note: lint level defined here
 LL | #![forbid(non_camel_case_types)]
    |           ^^^^^^^^^^^^^^^^^^^^
 
-error: type `foo` should have a camel case name such as `Foo`
+error: type `foo` should have an upper camel case name such as `Foo`
   --> $DIR/lint-non-camel-case-types.rs:7:1
    |
-LL | / struct foo { //~ ERROR type `foo` should have a camel case name such as `Foo`
+LL | / struct foo { //~ ERROR type `foo` should have an upper camel case name such as `Foo`
 LL | |     bar: isize,
 LL | | }
    | |_^
 
-error: type `foo2` should have a camel case name such as `Foo2`
+error: type `foo2` should have an upper camel case name such as `Foo2`
   --> $DIR/lint-non-camel-case-types.rs:11:1
    |
-LL | / enum foo2 { //~ ERROR type `foo2` should have a camel case name such as `Foo2`
+LL | / enum foo2 { //~ ERROR type `foo2` should have an upper camel case name such as `Foo2`
 LL | |     Bar
 LL | | }
    | |_^
 
-error: type `foo3` should have a camel case name such as `Foo3`
+error: type `foo3` should have an upper camel case name such as `Foo3`
   --> $DIR/lint-non-camel-case-types.rs:15:1
    |
-LL | / struct foo3 { //~ ERROR type `foo3` should have a camel case name such as `Foo3`
+LL | / struct foo3 { //~ ERROR type `foo3` should have an upper camel case name such as `Foo3`
 LL | |     bar: isize
 LL | | }
    | |_^
 
-error: type `foo4` should have a camel case name such as `Foo4`
+error: type `foo4` should have an upper camel case name such as `Foo4`
   --> $DIR/lint-non-camel-case-types.rs:19:1
    |
-LL | type foo4 = isize; //~ ERROR type `foo4` should have a camel case name such as `Foo4`
+LL | type foo4 = isize; //~ ERROR type `foo4` should have an upper camel case name such as `Foo4`
    | ^^^^^^^^^^^^^^^^^^
 
-error: variant `bar` should have a camel case name such as `Bar`
+error: variant `bar` should have an upper camel case name such as `Bar`
   --> $DIR/lint-non-camel-case-types.rs:22:5
    |
-LL |     bar //~ ERROR variant `bar` should have a camel case name such as `Bar`
+LL |     bar //~ ERROR variant `bar` should have an upper camel case name such as `Bar`
    |     ^^^
 
-error: trait `foo6` should have a camel case name such as `Foo6`
+error: trait `foo6` should have an upper camel case name such as `Foo6`
   --> $DIR/lint-non-camel-case-types.rs:25:1
    |
-LL | / trait foo6 { //~ ERROR trait `foo6` should have a camel case name such as `Foo6`
+LL | / trait foo6 { //~ ERROR trait `foo6` should have an upper camel case name such as `Foo6`
 LL | |     fn dummy(&self) { }
 LL | | }
    | |_^
 
-error: type parameter `ty` should have a camel case name such as `Ty`
+error: type parameter `ty` should have an upper camel case name such as `Ty`
   --> $DIR/lint-non-camel-case-types.rs:29:6
    |
-LL | fn f<ty>(_: ty) {} //~ ERROR type parameter `ty` should have a camel case name such as `Ty`
+LL | fn f<ty>(_: ty) {} //~ ERROR type parameter `ty` should have an upper camel case name such as `Ty`
    |      ^^
 
-error: type `X86__64` should have a camel case name such as `X86_64`
+error: type `X86__64` should have an upper camel case name such as `X86_64`
   --> $DIR/lint-non-camel-case-types.rs:38:1
    |
-LL | struct X86__64; //~ ERROR type `X86__64` should have a camel case name such as `X86_64`
+LL | struct X86__64; //~ ERROR type `X86__64` should have an upper camel case name such as `X86_64`
    | ^^^^^^^^^^^^^^^
 
-error: type `Abc_123` should have a camel case name such as `Abc123`
+error: type `Abc_123` should have an upper camel case name such as `Abc123`
   --> $DIR/lint-non-camel-case-types.rs:40:1
    |
-LL | struct Abc_123; //~ ERROR type `Abc_123` should have a camel case name such as `Abc123`
+LL | struct Abc_123; //~ ERROR type `Abc_123` should have an upper camel case name such as `Abc123`
    | ^^^^^^^^^^^^^^^
 
-error: type `A1_b2_c3` should have a camel case name such as `A1B2C3`
+error: type `A1_b2_c3` should have an upper camel case name such as `A1B2C3`
   --> $DIR/lint-non-camel-case-types.rs:42:1
    |
-LL | struct A1_b2_c3; //~ ERROR type `A1_b2_c3` should have a camel case name such as `A1B2C3`
+LL | struct A1_b2_c3; //~ ERROR type `A1_b2_c3` should have an upper camel case name such as `A1B2C3`
    | ^^^^^^^^^^^^^^^^
 
 error: aborting due to 11 previous errors