Apply suggestions from code review

Author: wxiaoguang

custom/conf/app.example.ini

@@ -129,8 +129,8 @@ RUN_USER = ; git
 ;; your SSH server node is not the same as HTTP node. For different protocol, the default
 ;; values are different. If `PROTOCOL` is `http+unix`, the default value is `http://unix/`.
 ;; If `PROTOCOL` is `fcgi` or `fcgi+unix`, the default value is `%(PROTOCOL)s://%(HTTP_ADDR)s:%(HTTP_PORT)s/`.
-;; If listen on `0.0.0.0`, the default value is `%(PROTOCOL)s://localhost:%(HTTP_PORT)s/`.
-;; Otherwise the default value is `%(PROTOCOL)s://%(HTTP_ADDR)s:%(HTTP_PORT)s/`.
+;; If listen on `0.0.0.0`, the default value is `{PROTOCOL}://localhost:{HTTP_PORT}/`.
+;; Otherwise the default value is `{PROTOCOL}://{HTTP_ADDR}:{HTTP_PORT}/`.
 ;; Most users don't need (and shouldn't) set this value.
 ;LOCAL_ROOT_URL =
 ;;
@@ -587,7 +587,7 @@ ENABLED = true
 [log]
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
-;; Root path for the log files - defaults to "GITEA_WORK_DIR/log"
+;; Root path for the log files - defaults to "{AppWorkPath}/log"
 ;ROOT_PATH =
 ;;
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
@@ -687,7 +687,7 @@ LEVEL = Info
 ;; The path of git executable. If empty, Gitea searches through the PATH environment.
 ;PATH =
 ;;
-;; The HOME directory for Git, defaults to "APP_DATA_PATH/home"
+;; The HOME directory for Git, defaults to "{APP_DATA_PATH}/home"
 ;HOME_PATH =
 ;;
 ;; Disables highlight of added and removed changes
@@ -951,7 +951,7 @@ LEVEL = Info
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 ;[repository]
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
-;; Root path for storing all repository data. By default, it is set to "APP_DATA_PATH/gitea-repositories".
+;; Root path for storing all repository data. By default, it is set to "{APP_DATA_PATH}/gitea-repositories".
 ;; A relative path is interpreted as "{AppWorkPath}/{ROOT}" (use AppWorkPath as base path).
 ;ROOT =
 ;;