use "*" instead of "all", improve comments

Author: wxiaoguang

custom/conf/app.example.ini

@@ -1397,7 +1397,7 @@ PATH =
 ;DELIVER_TIMEOUT = 5
 ;;
 ;; Webhook can only call allowed hosts for security reasons. Comma separated list, eg: external, 192.168.1.0/24, *.mydomain.com
-;; Built-in: loopback (for localhost), private (for LAN/intranet), external (for public hosts on internet), all (for all hosts)
+;; Built-in: loopback (for localhost), private (for LAN/intranet), external (for public hosts on internet), * (for all hosts)
 ;; CIDR list: 1.2.3.0/8, 2001:db8::/32
 ;; Wildcard hosts: *.mydomain.com, 192.168.100.*
 ; ALLOWED_HOST_LIST = external

docs/content/doc/advanced/config-cheat-sheet.en-us.md

@@ -586,7 +586,7 @@ Define allowed algorithms and their minimum key length (use -1 to disable a type
     - `loopback`: 127.0.0.0/8 for IPv4 and ::1/128 for IPv6, localhost is included.
     - `private`: RFC 1918 (10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16) and RFC 4193 (FC00::/7). Also called LAN/Intranet.
     - `external`: A valid non-private unicast IP, you can access all hosts on public internet. 
-    - `all`: All hosts are allowed.
+    - `*`: All hosts are allowed.
   - CIDR list: `1.2.3.0/8` for IPv4 and `2001:db8::/32` for IPv6
   - Wildcard hosts: `*.mydomain.com`, `192.168.100.*`
 - `SKIP_TLS_VERIFY`: **false**: Allow insecure certification.

modules/hostmatcher/hostmatcher.go

@@ -12,14 +12,15 @@ import (
 	"code.gitea.io/gitea/modules/util"
 )
 
-// HostMatchList is used to check if a host or ip is in a list
+// HostMatchList is used to check if a host or IP is in a list.
+// If you only need to do wildcard matching, consider to use modules/matchlist
 type HostMatchList struct {
 	hosts  []string
 	ipNets []*net.IPNet
 }
 
 // MatchBuiltinAll all hosts are matched
-const MatchBuiltinAll = "all"
+const MatchBuiltinAll = "*"
 
 // MatchBuiltinExternal A valid non-private unicast IP, all hosts on public internet are matched
 const MatchBuiltinExternal = "external"

modules/hostmatcher/hostmatcher_test.go

@@ -99,7 +99,7 @@ func TestHostOrIPMatchesList(t *testing.T) {
 		assert.Equalf(t, c.expected, hl.MatchesHostOrIP(c.host, c.ip), "case %s(%v)", c.host, c.ip)
 	}
 
-	hl = ParseHostMatchList("all")
+	hl = ParseHostMatchList("*")
 	cases = []tc{
 		{"", net.IPv4zero, true},
 		{"", net.ParseIP("127.0.0.1"), true},