docs: fix signature

Signed-off-by: Athan <[email protected]>

Author: kgryte

lib/node_modules/@stdlib/number/float64/base/assert/is-almost-equal-value/README.md

@@ -30,7 +30,7 @@ limitations under the License.
 var isAlmostEqualValue = require( '@stdlib/number/float64/base/assert/is-almost-equal-value' );
 ```
 
-#### isAlmostEqualValue( a, b )
+#### isAlmostEqualValue( a, b, maxULP )
 
 Tests if two double-precision floating-point numbers are approximately equal within a specified number of ULPs (units in the last place).