Merge branch 'master' into master

solutions/compound-types/string.md

@@ -155,7 +155,7 @@ fn main() {
 ```rust
 fn main() {
     let raw_str = "Escapes don't work here: \x3F \u{211D}";
-    // modify below line to make it work
+    // modify above line to make it work
     assert_eq!(raw_str, "Escapes don't work here: ? ℝ");
 
     // If you need quotes in a raw string, add a pair of #s
@@ -167,7 +167,7 @@ fn main() {
     let  delimiter = r###"A string with "# in it. And even "##!"###;
     println!("{}", delimiter);
 
-    // fill the blank
+    // Fill the blank
     let long_delimiter = r###"Hello, "##""###;
     assert_eq!(long_delimiter, "Hello, \"##\"")
 }