added --no-run option for rustdoc

src/librustdoc/config.rs

@@ -121,7 +121,7 @@ crate struct Options {
     /// For example, using ignore-foo to ignore running the doctest on any target that
     /// contains "foo" as a substring
     crate enable_per_target_ignores: bool,
-    /// Compile test but do not run them.
+    /// Do not run doctests, compile them if should_test is active.
     crate no_run: bool,
 
     /// The path to a rustc-like binary to build tests with. If not set, we

src/librustdoc/lib.rs

@@ -536,7 +536,7 @@ fn opts() -> Vec<RustcOptGroup> {
                 "[unversioned-shared-resources,toolchain-shared-resources,invocation-specific]",
             )
         }),
-        unstable("no-run", |o| o.optflag("", "no-run", "Compile doc tests without running it")),
+        unstable("no-run", |o| o.optflag("", "no-run", "Compile doctests without running them")),
     ]
 }