Rollup merge of rust-lang#114754 - workingjubilee:gamma-ray-logger, r=thomcc

Name what ln_gamma does

The previous description omitted some important details.

Author: matthiaskrgr

library/std/src/f32.rs

@@ -989,7 +989,9 @@ impl f32 {
         unsafe { cmath::tgammaf(self) }
     }
 
-    /// Returns the natural logarithm of the gamma function.
+    /// Natural logarithm of the absolute value of the gamma function
+    ///
+    /// The integer part of the tuple indicates the sign of the gamma function.
     ///
     /// # Examples
     ///

library/std/src/f64.rs

@@ -989,7 +989,9 @@ impl f64 {
         unsafe { cmath::tgamma(self) }
     }
 
-    /// Returns the natural logarithm of the gamma function.
+    /// Natural logarithm of the absolute value of the gamma function
+    ///
+    /// The integer part of the tuple indicates the sign of the gamma function.
     ///
     /// # Examples
     ///