auto merge of #16356 : ruud-v-a/rust/fix-f32-doc, r=steveklabnik

On a side note (but maybe this is not the right place to ask), the name `Float::two_pi` is inconsistent with `f32::consts::PI_2`.

Author: bors

src/libcore/num/f32.rs

@@ -293,7 +293,7 @@ impl Float for f32 {
     #[inline]
     fn frac_pi_8() -> f32 { consts::FRAC_PI_8 }
 
-    /// 1 .0/ pi
+    /// 1.0 / pi
     #[inline]
     fn frac_1_pi() -> f32 { consts::FRAC_1_PI }