Fix Marc C's name in credits file

Author: cowtowncoder

release-notes/CREDITS-2.x

@@ -1147,7 +1147,7 @@ Daniel Hrabovcak (TheSpiritXIII@github)
   * Reported #2796: `TypeFactory.constructType()` does not take `TypeBindings` correctly
   (2.11.2)
 
-Mark Carter (drekbour@github)
+Marc Carter (drekbour@github)
   * Contributed #43 implementation: Add option to resolve type from multiple existing properties,
    `@JsonTypeInfo(use=DEDUCTION)`
   (2.12.0)