Add new technical terms to docs spelling wordlist

Add deserialization, NFS, payloads, unpickler to the spelling
wordlist for the new CookieJar security documentation.

Co-Authored-By: Claude Opus 4.6 <[email protected]>

Author: YuvalElbar6

docs/spelling_wordlist.txt

@@ -100,6 +100,7 @@ deduplicate
 defs
 Dependabot
 deprecations
+deserialization
 DER
 dev
 Dev
@@ -213,7 +214,8 @@ Multipart
 musllinux
 mypy
 Nagle
-Nagle’s
+Nagle's
+NFS
 namedtuple
 nameservers
 namespace
@@ -235,6 +237,7 @@ param
 params
 parsers
 pathlib
+payloads
 peername
 performant
 pickleable
@@ -355,6 +358,7 @@ unhandled
 unicode
 unittest
 Unittest
+unpickler
 unix
 unobvious
 unsets