docs: fix return annotation style

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Author: Planeshifter

lib/node_modules/@stdlib/math/base/special/coth/src/main.c

@@ -62,7 +62,7 @@
 *
 * @example
 * double out = stdlib_base_coth( 0.0 );
-* // returns INFINITY
+* // returns +Infinity
 */
 
 double stdlib_base_coth( const double x ) {