Fix comments

rand_distr/src/pert.rs

@@ -51,8 +51,8 @@ pub enum PertError {
 impl fmt::Display for PertError {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         f.write_str(match self {
-            PertError::RangeTooSmall => "min..=max is not proper range in PERT distribution",
-            PertError::ModeRange => "mode is outside min..=max in PERT distribution",
+            PertError::RangeTooSmall => "requirement min < max is not met in PERT distribution",
+            PertError::ModeRange => "mode is outside [min, max] in PERT distribution",
             PertError::ShapeTooSmall => "shape < 0 or is NaN in PERT distribution",
         })
     }

rand_distr/src/triangular.rs

@@ -51,9 +51,9 @@ impl fmt::Display for TriangularError {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         f.write_str(match self {
             TriangularError::RangeTooSmall => {
-                "min..=max is not proper range in triangular distribution"
+                "requirement min <= max is not met in triangular distribution"
             }
-            TriangularError::ModeRange => "mode is outside min..=max in triangular distribution",
+            TriangularError::ModeRange => "mode is outside [min, max] in triangular distribution",
         })
     }
 }

src/distributions/bernoulli.rs

@@ -72,7 +72,7 @@ pub enum BernoulliError {
 impl fmt::Display for BernoulliError {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         f.write_str(match self {
-            BernoulliError::InvalidProbability => "p is outside 0..=1 in Bernoulli distribution",
+            BernoulliError::InvalidProbability => "p is outside [0, 1] in Bernoulli distribution",
         })
     }
 }