Update the list of reserved words.

doc/rust.md

@@ -210,19 +210,19 @@ The keywords in [source files](#source-files) are the following strings:
 
 ~~~~~~~~ {.keyword}
 alt assert
-break
+be break
 check claim class const cont copy crust
-do
+drop
 else enum export
 fail false fn for
 if iface impl import
 let log loop
 mod mut
-native
+native new
 pure
 resource ret
-true type
-unsafe use
+true trait type
+unchecked unsafe
 while
 ~~~~~~~~