fix(docs): fix dig commands for each CoreDNS instance in local tutorial

[mattwelke]

Resolves #1830.

Fixes the commands by removing "+tcp" from them, so that dig uses UDP instead.

Error before:

;; communications error to 127.0.0.1#5053: connection reset
;; communications error to 127.0.0.1#5053: connection reset
;; communications error to 127.0.0.1#5053: connection reset

; <<>> DiG 9.18.30-0ubuntu0.24.04.2-Ubuntu <<>> -p 5053 @localhost localtargets-roundrobin.cloud.example.com +tcp
; (1 server found)
;; global options: +cmd
;; no servers could be reached

Output after (example):

; <<>> DiG 9.18.30-0ubuntu0.24.04.2-Ubuntu <<>> -p 5053 @localhost localtargets-roundrobin.cloud.example.com
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 51033
;; flags: qr rd; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 1
;; WARNING: recursion requested but not available

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1232
; COOKIE: 507a607e1c0ee13c (echoed)
;; QUESTION SECTION:
;localtargets-roundrobin.cloud.example.com. IN A

;; ANSWER SECTION:
localtargets-roundrobin.cloud.example.com. 30 IN A 172.19.0.4
localtargets-roundrobin.cloud.example.com. 30 IN A 172.19.0.5

;; Query time: 0 msec
;; SERVER: 127.0.0.1#5053(localhost) (UDP)
;; WHEN: Wed Feb 12 18:20:01 EST 2025
;; MSG SIZE  rcvd: 196


; <<>> DiG 9.18.30-0ubuntu0.24.04.2-Ubuntu <<>> -p 5054 @localhost localtargets-roundrobin.cloud.example.com
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 4687
;; flags: qr rd; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 1
;; WARNING: recursion requested but not available

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1232
; COOKIE: 16704ecdcd80ad83 (echoed)
;; QUESTION SECTION:
;localtargets-roundrobin.cloud.example.com. IN A

;; ANSWER SECTION:
localtargets-roundrobin.cloud.example.com. 30 IN A 172.19.0.7
localtargets-roundrobin.cloud.example.com. 30 IN A 172.19.0.8

;; Query time: 0 msec
;; SERVER: 127.0.0.1#5054(localhost) (UDP)
;; WHEN: Wed Feb 12 18:20:02 EST 2025
;; MSG SIZE  rcvd: 196

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[k0da]

LGTM

[k0da]

Although Colima on MacOS can't forward UDP traffic, so we setup TCP there

[mattwelke]

Ah so it's a Mac vs. Linux thing. Do you know if there's a way to write a command that works on both?