docs: fix return annotation tag in C comments

Author: Planeshifter

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

@@ -24,7 +24,7 @@
 * Computes the arccosecant (in degrees) of a double-precision floating-point number.
 *
 * @param x    input value
-* @returns    arccosecant (in degrees)
+* @return     arccosecant (in degrees)
 *
 * @example
 * double v = stdlib_base_acscd( 1.0 );

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

@@ -111,7 +111,7 @@ static double rational_pq( const double x ) {
 * Evaluates the digamma function via asymptotic expansion.
 *
 * @param x    input value
-* @returns    function value
+* @return     function value
 */
 static double asymptoticApprox( const double x ) {
 	double y;
@@ -129,7 +129,7 @@ static double asymptoticApprox( const double x ) {
 * Evaluates the digamma function over interval `[1,2]`.
 *
 * @param x    input value
-* @returns    function value
+* @return     function value
 */
 static double rationalApprox( const double x ) {
 	double g;
@@ -211,7 +211,7 @@ static double rationalApprox( const double x ) {
 * -   Max error found: \\(2.452\mbox{e-}17\\) (double precision)
 *
 * @param x    input value
-* @returns    function value
+* @return     function value
 *
 * @example
 * double v = stdlib_base_digamma( -2.5 );

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

@@ -26,7 +26,7 @@
 * Computes the hyperbolic arctangent of a number.
 *
 * @param x    input value
-* @returns    hyperbolic arctangent (in radians)
+* @return     hyperbolic arctangent (in radians)
 *
 * @example
 * double v = stdlib_base_fast_atanh( 0.0 );