docs: Update FCrDNS documentation and spelling

Corrected a typo in the `verifyFCrDNS` function documentation.

Additionally, updated the spelling exception list to include new terms and remove redundant entries.

Author: btomaev

.github/actions/spelling/expect.txt

@@ -14,7 +14,6 @@ apnic
 APNICRANDNETAU
 Applebot
 archlinux
-Arpa
 arpa
 asnc
 asnchecker
@@ -113,6 +112,7 @@ Factset
 fahedouch
 fastcgi
 FCr
+fcrdns
 fediverse
 ffprobe
 financials
@@ -162,7 +162,6 @@ hostable
 htmlc
 htmx
 httpdebug
-Huawei
 huawei
 hypertext
 iaskspider
@@ -356,6 +355,7 @@ valkey
 Varis
 Velen
 vendored
+verify
 vhosts
 vkbot
 VKE
@@ -373,7 +373,6 @@ wildbase
 withthothmock
 wolfbeast
 wordpress
-Workaround
 workaround
 workdir
 wpbot

docs/docs/admin/configuration/expressions.mdx

@@ -356,7 +356,7 @@ function verifyFCrDNS(ip: string, pattern: string): bool;
 `verifyFCrDNS` checks if the reverse DNS of an IP address matches its forward DNS. This is a common technique to filter out spam and bot traffic. `verifyFCrDNS` comes in two forms:
 
 - `verifyFCrDNS(remoteAddress)` will check that the reverse DNS of the remote address resolves back to the remote address. If no PTR records, returns true.
-- `verifyFCrDNS(remoteAddress, pattren)` will check that the reverse DNS of the remote address is matching with pattern and that name resolves back to the remote address.
+- `verifyFCrDNS(remoteAddress, pattern)` will check that the reverse DNS of the remote address is matching with pattern and that name resolves back to the remote address.
 
 This is best used in rules like this: