docs: fix TSDoc issues in several math/iter declarations

lib/node_modules/@stdlib/math/iter/sequences/nonpositive-even-integers/docs/types/index.d.ts

@@ -44,7 +44,7 @@ interface Options {
 *
 * @param options - function options
 * @param options.iter - number of iterations (default: 4503599627370497)
-* @throws `iter` option must be a nonpositive integer
+* @throws `iter` option must be a nonnegative integer
 * @returns iterator
 *
 * @example

lib/node_modules/@stdlib/math/iter/special/acoth/docs/types/index.d.ts

@@ -30,7 +30,7 @@ type Iterator = Iter | IterableIterator;
 *
 * ## Notes
 *
-* -   The domain of inverse hyperbolic cotangent is restricted to `(-inf,-1]` and `[1,inf)`. If an iterated value is outside of the domain, the returned iterator returns `NaN`.
+* -   The domain of inverse hyperbolic cotangent is restricted to `(-infinity,-1]` and `[1,+infinity)`. If an iterated value is outside of the domain, the returned iterator returns `NaN`.
 * -   If an environment supports `Symbol.iterator` **and** a provided iterator is iterable, the returned iterator is iterable.
 *
 * @param iterator - input iterator

lib/node_modules/@stdlib/math/iter/special/ahaversin/docs/types/index.d.ts

@@ -26,11 +26,11 @@ import { Iterator as Iter, IterableIterator } from '@stdlib/types/iter';
 type Iterator = Iter | IterableIterator;
 
 /**
-* Returns an iterator which iteratively computes the inverse half-value versed sin.
+* Returns an iterator which iteratively computes the inverse half-value versed sine.
 *
 * ## Notes
 *
-* -   The domain of inverse half-value versed sin is restricted to `[0,1]`. If an iterated value is outside of the domain, the returned iterator returns `NaN`.
+* -   The domain of inverse half-value versed sine is restricted to `[0,1]`. If an iterated value is outside of the domain, the returned iterator returns `NaN`.
 * -   If an environment supports `Symbol.iterator` **and** a provided iterator is iterable, the returned iterator is iterable.
 *
 * @param iterator - input iterator

lib/node_modules/@stdlib/math/iter/tools/map/docs/types/index.d.ts

@@ -32,7 +32,7 @@
 	/**
 	* Return value when an input iterator yields a non-numeric value.
 	*/
 	invalid?: any;
 }
 
 /**
@@ -41,7 +41,7 @@
 * @param value - iterated value
 * @returns result
 */
 type Unary = ( value: number ) => any;
 
 /**
 * Returns an iterator which invokes a unary function accepting a single numeric argument for each iterated value.
@@ -52,6 +52,8 @@
 *
 *     -   `value`: iterated value
 *
+* -   If an iterated value is non-numeric (including `NaN`), the returned iterator returns `NaN`. If non-numeric iterated values are possible, you are advised to provide an iterator which type checks and handles non-numeric values accordingly.
+*
 * -   If an environment supports `Symbol.iterator` **and** a provided iterator is iterable, the returned iterator is iterable.
 *
 * @param iterator - input iterator