docs: use "probability mass function" instead of "probability density function" for PMF methods

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

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Author: Planeshifter

lib/node_modules/@stdlib/stats/base/dists/binomial/ctor/lib/main.js

@@ -317,7 +317,7 @@ setReadOnlyAccessor( Binomial.prototype, 'variance', function get() {
 setReadOnly( Binomial.prototype, 'cdf', binomialCDF );
 
 /**
-* Evaluates the natural logarithm of the probability density function (PMF).
+* Evaluates the natural logarithm of the probability mass function (PMF).
 *
 * @name logpmf
 * @memberof Binomial.prototype
@@ -353,7 +353,7 @@ setReadOnly( Binomial.prototype, 'logpmf', binomialLogPMF );
 setReadOnly( Binomial.prototype, 'mgf', binomialMGF );
 
 /**
-* Evaluates the probability density function (PMF).
+* Evaluates the probability mass function (PMF).
 *
 * @name pmf
 * @memberof Binomial.prototype

lib/node_modules/@stdlib/stats/base/dists/hypergeometric/ctor/lib/main.js

@@ -311,7 +311,7 @@ setReadOnlyAccessor( Hypergeometric.prototype, 'variance', function get() {
 setReadOnly( Hypergeometric.prototype, 'cdf', hypergeometricCDF );
 
 /**
-* Evaluates the natural logarithm of the probability density function (PMF).
+* Evaluates the natural logarithm of the probability mass function (PMF).
 *
 * @name logpmf
 * @memberof Hypergeometric.prototype
@@ -329,7 +329,7 @@ setReadOnly( Hypergeometric.prototype, 'cdf', hypergeometricCDF );
 setReadOnly( Hypergeometric.prototype, 'logpmf', hypergeometricLogPMF );
 
 /**
-* Evaluates the probability density function (PMF).
+* Evaluates the probability mass function (PMF).
 *
 * @name pmf
 * @memberof Hypergeometric.prototype