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

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"]
     pub fn mul_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"]

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"]
     pub fn mul_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"]

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")]

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")]