chore: use correct value to disable timeouts in example config (#12985)

These values are parsed as durations, and rejected if they encounter parsing errors. "-1" lacks a unit, and is rejected. The end result is that setting PER_WRITE_TIMEOUT = -1 just uses the default 30s

See also forgejo/docs!2005

Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/12985
Reviewed-by: Gusted <gusted@noreply.codeberg.org>

Author: drewcassidy

custom/conf/app.example.ini

@@ -118,7 +118,7 @@ RUN_USER = ; git
 ;; SSL Cipher Suites
 ;SSL_CIPHER_SUITES=; Will default to "ecdhe_ecdsa_with_aes_256_gcm_sha384,ecdhe_rsa_with_aes_256_gcm_sha384,ecdhe_ecdsa_with_aes_128_gcm_sha256,ecdhe_rsa_with_aes_128_gcm_sha256,ecdhe_ecdsa_with_chacha20_poly1305,ecdhe_rsa_with_chacha20_poly1305" if aes is supported by hardware, otherwise chacha will be first.
 ;;
-;; Timeout for any write to the connection. (Set to -1 to disable all timeouts.)
+;; Timeout for any write to the connection. (Set to -1s to disable all timeouts.)
 ;PER_WRITE_TIMEOUT = 30s
 ;;
 ;; Timeout per Kb written to connections.
@@ -232,7 +232,7 @@ RUN_USER = ; git
 ;; Command template for authorized keys entries
 ;SSH_AUTHORIZED_KEYS_COMMAND_TEMPLATE = {{.AppPath}} --config={{.CustomConf}} serv key-{{.Key.ID}}
 ;;
-;; Timeout for any write to ssh connections. (Set to -1 to disable all timeouts.)
+;; Timeout for any write to ssh connections. (Set to -1s to disable all timeouts.)
 ;; Will default to the PER_WRITE_TIMEOUT.
 ;SSH_PER_WRITE_TIMEOUT = 30s
 ;;
@@ -1378,7 +1378,7 @@ LEVEL = Info
 ;;
 ;; Control how often the notification endpoint is polled to update the notification
 ;; The timeout will increase to MAX_TIMEOUT in TIMEOUT_STEPs if the notification count is unchanged
-;; Set MIN_TIMEOUT to -1 to turn off
+;; Set MIN_TIMEOUT to -1s to turn off polling
 ;MIN_TIMEOUT = 10s
 ;MAX_TIMEOUT = 60s
 ;TIMEOUT_STEP = 10s
@@ -1470,7 +1470,7 @@ LEVEL = Info
 ;ISSUE_INDEXER_NAME = gitea_issues
 ;;
 ;; Timeout the indexer if it takes longer than this to start.
-;; Set to -1 to disable timeout.
+;; Set to -1s to disable timeout.
 ;STARTUP_TIMEOUT = 30s
 ;;
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;