Corrected English typos

src/math/ceil.rs

@@ -20,7 +20,7 @@ pub fn ceil(x: f64) -> f64 {
     {
         //use an alternative implementation on x86, because the
         //main implementation fails with the x87 FPU used by
-        //debian i386, probablly due to excess precision issues.
+        //debian i386, probably due to excess precision issues.
         //basic implementation taken from https://github.com/rust-lang/libm/issues/219
         use super::fabs;
         if fabs(x).to_bits() < 4503599627370496.0_f64.to_bits() {

src/math/floor.rs

@@ -20,7 +20,7 @@ pub fn floor(x: f64) -> f64 {
     {
         //use an alternative implementation on x86, because the
         //main implementation fails with the x87 FPU used by
-        //debian i386, probablly due to excess precision issues.
+        //debian i386, probably due to excess precision issues.
         //basic implementation taken from https://github.com/rust-lang/libm/issues/219
         use super::fabs;
         if fabs(x).to_bits() < 4503599627370496.0_f64.to_bits() {

src/math/pow.rs

@@ -16,7 +16,7 @@
 //      1. Compute and return log2(x) in two pieces:
 //              log2(x) = w1 + w2,
 //         where w1 has 53-24 = 29 bit trailing zeros.
-//      2. Perform y*log2(x) = n+y' by simulating muti-precision
+//      2. Perform y*log2(x) = n+y' by simulating multi-precision
 //         arithmetic, where |y'|<=0.5.
 //      3. Return x**y = 2**n*exp(y'*log2)
 //

src/math/sqrt.rs

@@ -96,7 +96,7 @@ pub fn sqrt(x: f64) -> f64 {
     {
         // Note: This path is unlikely since LLVM will usually have already
         // optimized sqrt calls into hardware instructions if sse2 is available,
-        // but if someone does end up here they'll apprected the speed increase.
+        // but if someone does end up here they'll appreciate the speed increase.
         #[cfg(target_arch = "x86")]
         use core::arch::x86::*;
         #[cfg(target_arch = "x86_64")]

src/math/sqrtf.rs

@@ -31,7 +31,7 @@ pub fn sqrtf(x: f32) -> f32 {
     {
         // Note: This path is unlikely since LLVM will usually have already
         // optimized sqrt calls into hardware instructions if sse is available,
-        // but if someone does end up here they'll apprected the speed increase.
+        // but if someone does end up here they'll appreciate the speed increase.
         #[cfg(target_arch = "x86")]
         use core::arch::x86::*;
         #[cfg(target_arch = "x86_64")]