chore: update notes and ensure n is first argument in examples

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---

Author: Planeshifter

lib/node_modules/@stdlib/math/base/special/polygamma/README.md

@@ -116,7 +116,7 @@ var opts = {
 var x = uniform( 100, -50.0, 50.0, opts );
 var n = discreteUniform( 100, 0, 50, opts );
 
-logEachMap( 'x: %0.4f, ψ^(%d)(x): %0.4f', x, n, polygamma );
+logEachMap( 'ψ^(%d)(x = %0.4f): %0.4f', n, x, polygamma );
 ```
 
 </section>

lib/node_modules/@stdlib/math/base/special/polygamma/docs/repl.txt

@@ -5,7 +5,8 @@
 
     If `n` is not a nonnegative integer, the function returns `NaN`.
 
-    If `x` is zero or a negative integer, the function returns `NaN`.
+    If `x` is zero or a negative odd integer, the function returns `+Infinity`.
+    If `x` is a negative even integer, the function returns `NaN`.
 
     If provided `NaN` as either parameter, the function returns `NaN`.
 

lib/node_modules/@stdlib/math/base/special/polygamma/docs/types/index.d.ts

@@ -24,7 +24,8 @@
 * ## Notes
 *
 * -   If `n` is not a nonnegative integer, the function returns `NaN`.
-* -   If `x` is zero or a negative integer, the function returns `NaN`.
+* -   If `x` is zero or a negative odd integer, the function returns `+Infinity`.
+* -   If `x` is a negative even integer, the function returns `NaN`.
 *
 * @param n - order of derivative
 * @param x - input value

lib/node_modules/@stdlib/math/base/special/polygamma/examples/index.js

@@ -29,4 +29,4 @@ var opts = {
 var x = uniform( 100, -50.0, 50.0, opts );
 var n = discreteUniform( 100, 0, 50, opts );
 
-logEachMap( 'x: %0.4f, ψ^(%d)(x): %0.4f', x, n, polygamma );
+logEachMap( 'ψ^(%d)(x = %0.4f): %0.4f', n, x, polygamma );