docs: improve function documentation for stdlib_base_log1pf

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Author: 0PrashantYadav0

lib/node_modules/@stdlib/math/base/special/log1pf/include/stdlib/math/base/special/log1pf.h

@@ -27,7 +27,7 @@ extern "C" {
 #endif
 
 /**
-* Evaluates the natural logarithm of `1+x` in single‐precision.
+Evaluates the natural logarithm of `1+x` in single‐precision floating-point number.
 */
 float stdlib_base_log1pf( const float x );