docs: update function signature

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Author: anandkaranubc

lib/node_modules/@stdlib/math/base/special/kernel-sinf/README.md

@@ -30,7 +30,7 @@ limitations under the License.
 var kernelSinf = require( '@stdlib/math/base/special/kernel-sinf' );
 ```
 
-#### kernelSinf( x, y )
+#### kernelSinf( x )
 
 Computes the [sine][sine] of a single-precision floating-point number on `[-π/4, π/4]`.