Fix error explanation formatting

Author: alygin

src/librustc_metadata/diagnostics.rs

@@ -56,9 +56,10 @@ An unknown "kind" was specified for a link attribute. Erroneous code example:
 ```
 
 Please specify a valid "kind" value, from one of the following:
- * static
- * dylib
- * framework
+
+ - static
+ - dylib
+ - framework
 "##,
 
 E0459: r##"

src/librustc_typeck/diagnostics.rs

@@ -1377,8 +1377,9 @@ let x = |_| {}; // error: cannot determine a type for this expression
 ```
 
 You have two possibilities to solve this situation:
- * Give an explicit definition of the expression
- * Infer the expression
+
+ - Give an explicit definition of the expression
+ - Infer the expression
 
 Examples:
 

src/libsyntax/diagnostic_list.rs

@@ -65,8 +65,8 @@ fn main() {}
 
 The `inline` attribute only supports two arguments:
 
- * always
- * never
+ - always
+ - never
 
 All other arguments given to the `inline` attribute will return this error.
 Example:
@@ -121,9 +121,9 @@ pub fn main() {}
 
 The `cfg` attribute supports only three kinds of predicates:
 
- * any
- * all
- * not
+ - any
+ - all
+ - not
 
 Example: