Auto merge of rust-lang#5735 - enizor:doc-profile-debug, r=alexcrichton

Doc: manifest profile.X.debug can be either an u32 or a bool

See rust-lang#5734

src/doc/src/reference/manifest.md

@@ -304,8 +304,8 @@ along with the defaults for each profile.
 opt-level = 0      # controls the `--opt-level` the compiler builds with.
                    # 0-1 is good for debugging. 2 is well-optimized. Max is 3.
                    # 's' attempts to reduce size, 'z' reduces size even more.
-debug = true       # include debug information (debug symbols). Equivalent to
-                   # `-C debuginfo=2` compiler flag.
+debug = true       # (u32 or bool) Include debug information (debug symbols).
+                   # Equivalent to `-C debuginfo=2` compiler flag.
 rpath = false      # controls whether compiler should set loader paths.
                    # If true, passes `-C rpath` flag to the compiler.
 lto = false        # Link Time Optimization usually reduces size of binaries