refactor: fix C implementation

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---

Author: anandkaranubc

lib/node_modules/@stdlib/math/base/special/kernel-log1pf/src/addon.c

@@ -19,5 +19,4 @@
 #include "stdlib/math/base/special/kernel_log1pf.h"
 #include "stdlib/math/base/napi/unary.h"
 
-// cppcheck-suppress shadowFunction
 STDLIB_MATH_BASE_NAPI_MODULE_F_F( stdlib_base_kernel_log1pf )

lib/node_modules/@stdlib/math/base/special/kernel-log1pf/src/main.c

@@ -18,7 +18,7 @@
 *
 * ## Notice
 *
-* The following copyright, license, and long comment were part of the original implementation available as part of [FreeBSD]{@link https://svnweb.freebsd.org/base/release/12.2.0/lib/msun/src/k_log.c}. The implementation follows the original, but has been modified according to project conventions.
+* The following copyright, license, and long comment were part of the original implementation available as part of [FreeBSD]{@link https://svnweb.freebsd.org/base/release/12.2.0/lib/msun/src/k_logf.h}. The implementation follows the original, but has been modified according to project conventions.
 *
 * ```text
 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
@@ -50,7 +50,7 @@
 * @return     evaluated polynomial
 */
 static float polyval_p( const float x ) {
-	return 0.40000972152 + (x * 0.24279078841);
+	return 0.40000972152f + (x * 0.24279078841f);
 }
 
 // END: polyval_p
@@ -70,15 +70,15 @@ static float polyval_p( const float x ) {
 * @return     evaluated polynomial
 */
 static float polyval_q( const float x ) {
-	return 0.66666662693 + (x * 0.28498786688);
+	return 0.66666662693f + (x * 0.28498786688f);
 }
 
 // END: polyval_q
 
 /* End auto-generated functions. */
 
 /**
-* Computes `logf(1+f) - f` for `1+f` in `~[sqrtf(2)/2, sqrtf(2)]`.
+* Computes `log(1+f) - f` for `1+f` in `~[sqrt(2)/2, sqrt(2)]` as a single-precision floating-point number.
 *
 * ## Method
 *
@@ -154,10 +154,10 @@ static float polyval_q( const float x ) {
 *     where \\(n \cdot \operatorname{ln2}_{hi}\\) is always exact for \\(|n| < 2000\\).
 *
 * @param f    input value
-* @return     output value
+* @return     function value
 *
 * @example
-* float out = stdlib_base_kernel_log1p( 1.0f );
+* float out = stdlib_base_kernel_log1pf( 1.0f );
 * // returns ~0.1931f
 */
 float stdlib_base_kernel_log1pf( const float f ) {