Revert "Fix typo in documentation (#318)"

This reverts commit d47b27c0b95b5f43f4ade7389838fe7662518f19.
diff --git a/docs/PRIMITIVES.md b/docs/PRIMITIVES.md
index f788338..24ebb9f 100644
--- a/docs/PRIMITIVES.md
+++ b/docs/PRIMITIVES.md
@@ -75,7 +75,7 @@
 
 Primitive          | Go Implementations
 ------------------ | ------------------------------------------------------------------------
-AEAD               | AES-GCM, AES-CTR-HMAC, KMS Envelope, CHACHA20-POLY1305, XCHACHA-POLY1305
+AEAD               | AES-GCM, AES-CTR-HMAC, KMS Envelope, CHACHA20-PLOY1305, XCHACHA-POLY1305
 Deterministic AEAD | AES-SIV
 MAC                | HMAC-SHA2
 Digital Signatures | ECDSA over NIST curves, Ed25519