Add doc aliases for libm and IEEE names

Searching "fma" in the Rust documentation returns results for
`intrinsics::fma*`, but does not point to the user-facing `mul_add`. Add
aliases for `fma*` and the IEEE operation name `fusedMultiplyAdd`. Add
the IEEE name to `sqrt` as well, `squareRoot`.

Author: tgross35

library/std/src/f128.rs

@@ -227,6 +227,7 @@ impl f128 {
 /// ```
 #[inline]
 #[rustc_allow_incoherent_impl]
+#[doc(alias = "fmaf128", alias = "fusedMultiplyAdd")]
 #[unstable(feature = "f128", issue = "116909")]
 #[must_use = "method returns a new number and does not mutate the original value"]
 pubfnmul_add(self,a:f128,b:f128) -> f128{
@@ -384,6 +385,7 @@ impl f128 {
 /// # }
 /// ```
 #[inline]
+#[doc(alias = "squareRoot")]
 #[rustc_allow_incoherent_impl]
 #[unstable(feature = "f128", issue = "116909")]
 #[must_use = "method returns a new number and does not mutate the original value"]

library/std/src/f16.rs

@@ -228,6 +228,7 @@ impl f16 {
 #[inline]
 #[rustc_allow_incoherent_impl]
 #[unstable(feature = "f16", issue = "116909")]
+#[doc(alias = "fmaf16", alias = "fusedMultiplyAdd")]
 #[must_use = "method returns a new number and does not mutate the original value"]
 pubfnmul_add(self,a:f16,b:f16) -> f16{
 unsafe{ intrinsics::fmaf16(self, a, b)}
@@ -384,6 +385,7 @@ impl f16 {
 /// # }
 /// ```
 #[inline]
+#[doc(alias = "squareRoot")]
 #[rustc_allow_incoherent_impl]
 #[unstable(feature = "f16", issue = "116909")]
 #[must_use = "method returns a new number and does not mutate the original value"]

library/std/src/f32.rs

@@ -210,6 +210,7 @@ impl f32 {
 /// assert_eq!(one_plus_eps * one_minus_eps + minus_one, 0.0);
 /// ```
 #[rustc_allow_incoherent_impl]
+#[doc(alias = "fmaf", alias = "fusedMultiplyAdd")]
 #[must_use = "method returns a new number and does not mutate the original value"]
 #[stable(feature = "rust1", since = "1.0.0")]
 #[inline]
@@ -360,6 +361,7 @@ impl f32 {
 /// assert!(negative.sqrt().is_nan());
 /// assert!(negative_zero.sqrt() == negative_zero);
 /// ```
+#[doc(alias = "squareRoot")]
 #[rustc_allow_incoherent_impl]
 #[must_use = "method returns a new number and does not mutate the original value"]
 #[stable(feature = "rust1", since = "1.0.0")]

library/std/src/f64.rs

@@ -210,6 +210,7 @@ impl f64 {
 /// assert_eq!(one_plus_eps * one_minus_eps + minus_one, 0.0);
 /// ```
 #[rustc_allow_incoherent_impl]
+#[doc(alias = "fma", alias = "fusedMultiplyAdd")]
 #[must_use = "method returns a new number and does not mutate the original value"]
 #[stable(feature = "rust1", since = "1.0.0")]
 #[inline]
@@ -360,6 +361,7 @@ impl f64 {
 /// assert!(negative.sqrt().is_nan());
 /// assert!(negative_zero.sqrt() == negative_zero);
 /// ```
+#[doc(alias = "squareRoot")]
 #[rustc_allow_incoherent_impl]
 #[must_use = "method returns a new number and does not mutate the original value"]
 #[stable(feature = "rust1", since = "1.0.0")]