chore: update return to add f suffix

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---

Author: officiallyanee

lib/node_modules/@stdlib/math/base/special/digammaf/README.md

@@ -145,10 +145,10 @@ Evaluates the [digamma function][digamma-function] for a single-precision floati
 
 ```c
 float out = stdlib_base_digammaf( 1.0f );
-// returns ~-0.577
+// returns ~-0.577f
 
 out = stdlib_base_digammaf( 2.0f );
-// returns ~0.423
+// returns ~0.423f
 ```
 
 The function accepts the following arguments: