misc: spelling fixes

Found using codespell 2.2.1.

Also delete the redundant protocol designator from an archive.org URL.

Reviewed-by: Daniel Stenberg
Closes #9403

tests/data/test368

@@ -27,7 +27,7 @@ Connection: close
 http
 </server>
  <name>
-Appened dash if -r range specified without one
+Append dash if -r range specified without one
  </name>
  <command>
 http://%HOSTIP:%HTTPPORT/%TESTNUMBER -r 4

tests/data/test435

@@ -23,7 +23,7 @@ Content-Length: 0
 http
 </server>
 <name>
-verify -w local/remote port+ip after connecton re-use
+verify -w local/remote port+ip after connection re-use
 </name>
 <command>
 http://%HOSTIP:%HTTPPORT/%TESTNUMBER http://%HOSTIP:%HTTPPORT/%TESTNUMBER -w 'local port == %{local_port}\nlocal ip == %{local_ip}\nremote_ip == %{remote_ip}\nremote_port == %{remote_port}\n'

tests/libtest/lib1906.c

@@ -39,7 +39,7 @@ int test(char *URL)
   curl_easy_setopt(curl, CURLOPT_CURLU, curlu);
   curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, error_buffer);
   curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);
-  /* set a port number that makes this reqeuest fail */
+  /* set a port number that makes this request fail */
   curl_easy_setopt(curl, CURLOPT_PORT, 1L);
   curl_code = curl_easy_perform(curl);
   if(!curl_code)

tests/unit/unit1655.c

@@ -105,7 +105,7 @@ do {
     struct demo victim;
     DOHcode d;
 
-    victim.canary1 = 87; /* magic numbers, arbritrarily picked */
+    victim.canary1 = 87; /* magic numbers, arbitrarily picked */
     victim.canary2 = 35;
     victim.canary3 = 41;
     d = doh_encode(name, DNS_TYPE_A, victim.dohbuffer,