issue(5801): adding tests for comment wrapping

tests/source/configs/comment_width/5801.rs

@@ -0,0 +1,16 @@
+// rustfmt-comment_width: 120
+// rustfmt-wrap_comments: true
+// rustfmt-unstable_features: true
+// rustfmt-max_width: 120
+
+/// This function is 120 columns wide and is left alone. This comment is 120 columns wide and the formatter is also fine
+fn my_super_cool_function_name(my_very_cool_argument_name: String, my_other_very_cool_argument_name: String) -> String {
+    unimplemented!()
+}
+
+pub enum Severity {
+    /// But here, this comment is 120 columns wide and the formatter wants to split it up onto two separate lines still.
+    Error,
+    /// This comment is 119 columns wide and works perfectly. Lorem ipsum. lorem ipsum. lorem ipsum. lorem ipsum lorem.
+    Warning,
+}

tests/target/configs/comment_width/5801.rs

@@ -0,0 +1,16 @@
+// rustfmt-comment_width: 120
+// rustfmt-wrap_comments: true
+// rustfmt-unstable_features: true
+// rustfmt-max_width: 120
+
+/// This function is 120 columns wide and is left alone. This comment is 120 columns wide and the formatter is also fine
+fn my_super_cool_function_name(my_very_cool_argument_name: String, my_other_very_cool_argument_name: String) -> String {
+    unimplemented!()
+}
+
+pub enum Severity {
+    /// But here, this comment is 120 columns wide and the formatter wants to split it up onto two separate lines still.
+    Error,
+    /// This comment is 119 columns wide and works perfectly. Lorem ipsum. lorem ipsum. lorem ipsum. lorem ipsum lorem.
+    Warning,
+}