Update credits

Author: cowtowncoder

release-notes/CREDITS-2.x

@@ -8,9 +8,9 @@ Author: Tatu Saloranta, tatu.saloranta@iki.fi
 
 Co-Authors (with only partial listings below):
 
-* Joo Hyuk Kim (JooHyukKim@github)
-* PJ Fanning (pjfanning@github)
-* Sim Yih Tsern (yihtsern@github)
+* Joo Hyuk Kim (@JooHyukKim)
+* PJ Fanning (@pjfanning)
+* Sim Yih Tsern (@yihtsern)
 
 ----------------------------------------------------------------------------
 
@@ -1625,9 +1625,9 @@ Sim Yih Tsern (yihtsern@github)
  * Contributed fix for #3897: 2.15.0 breaks deserialization when POJO/Record only has a
    single field and is marked `Access.WRITE_ONLY`
   (2.15.1)
- * Contributed fux fix #3968: Records with additional constructors failed to deserialize
+ * Contributed fix for #3968: Records with additional constructors failed to deserialize
   (2.15.3)
-
+ ... and many more (as of 2.18)
 
 Ajay Siwach (Siwach16@github)
   * Contributed #3637: Add enum features into `@JsonFormat.Feature`