docs: fix miscellaneous TSDoc issues in @stdlib/math declarations

Correct documentation-only issues flagged by an audit:

- `base/utils/float64-epsilon-difference`: add the `@throws must
  provide a recognized scale function name` tag that the sibling
  `relative-difference` documents. `epsilonDifference` accepts the same
  `scale` argument and delegates to `reldiff`, which throws on an
  unrecognized scale-name string.
- `special/abs`: remove an unused `@stdlib/ndarray/to-array` require
  from an `@example`, and correct the malformed `// returns
  <ndarray>[ ... ]` annotations to `// returns <ndarray>` (the
  operations return ndarrays, not array literals).

This PR addresses only the TypeScript declaration files. The matching
namespace aggregators are generated and will pick up these fixes on
regeneration.

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---

Author: Planeshifter

lib/node_modules/@stdlib/math/base/utils/float64-epsilon-difference/docs/types/index.d.ts

@@ -60,6 +60,7 @@ type ScaleNames = 'max-abs' | 'max' | 'min-abs' | 'min' | 'mean-abs' | 'mean' |
 * @param x - first number
 * @param y - second number
 * @param scale - scale function (default: 'max-abs')
+* @throws must provide a recognized scale function name
 * @returns relative difference in units of double-precision floating-point epsilon
 *
 * @example

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

@@ -69,7 +69,7 @@ interface UnaryFunction {
 	* // returns <ndarray>
 	*
 	* var y = abs( x );
-	* // returns <ndarray>[ [ 1.0, 2.0 ], [ 3.0, 4.0 ] ]
+	* // returns <ndarray>
 	*/
 	( x: InputArray, options?: Options ): typedndarray<number>; // FIXME: we lose type specificity here, as the output ndarray data type is determined according to the output data type policy in conjunction with the `dtype` option
 
@@ -87,7 +87,7 @@ interface UnaryFunction {
 	* var y = array( [ [ 0.0, 0.0 ], [ 0.0, 0.0 ] ] );
 	*
 	* var z = abs.assign( x, y );
-	* // returns <ndarray>[ [ 1.0, 2.0 ], [ 3.0, 4.0 ] ]
+	* // returns <ndarray>
 	*
 	* var bool = ( z === y );
 	* // returns true
@@ -108,17 +108,16 @@ interface UnaryFunction {
 * var x = array( [ [ -1.0, -2.0 ], [ -3.0, -4.0 ] ] );
 *
 * var y = abs( x );
-* // returns <ndarray>[ [ 1.0, 2.0 ], [ 3.0, 4.0 ] ]
+* // returns <ndarray>
 *
 * @example
-* var ndarray2array = require( '@stdlib/ndarray/to-array' );
 * var array = require( '@stdlib/ndarray/array' );
 *
 * var x = array( [ [ -1.0, -2.0 ], [ -3.0, -4.0 ] ] );
 * var y = array( [ [ 0.0, 0.0 ], [ 0.0, 0.0 ] ] );
 *
 * var z = abs.assign( x, y );
-* // returns <ndarray>[ [ 1.0, 2.0 ], [ 3.0, 4.0 ] ]
+* // returns <ndarray>
 *
 * var bool = ( z === y );
 * // returns true