all: format code according to Go 1.19 rules

Go 1.19 started reformatting code in a way that makes it more obvious
how it will be rendered on pkg.go.dev. It gets it almost right, but not
entirely. Therefore, I had to modify some of the comments so that they
are formatted correctly.

src/reflect/deepequal.go

@@ -132,7 +132,7 @@ func deepValueEqual(v1, v2 Value, visited map[visit]struct{}) bool {
 	}
 }
 
-// DeepEqual reports whether x and y are ``deeply equal,'' defined as follows.
+// DeepEqual reports whether x and y are “deeply equal”, defined as follows.
 // Two values of identical type are deeply equal if one of the following cases applies.
 // Values of distinct types are never deeply equal.
 //