fix `--use-async-build-server` docs

docs/en/manuals/bob.md

@@ -123,9 +123,8 @@ usage: bob [options] [commands]
  -tp,--texture-profiles <arg>            DEPRECATED! Use
                                          --texture-compression instead
  -u,--auth <arg>                         User auth token
-    --use-async-build-server             Use an async build process for
-                                         the build server (when using
-                                         native extensions)
+    --use-async-build-server             DEPRECATED! Asynchronous build
+                                         is now the default.
     --use-lua-bytecode-delta             Use byte code delta compression
                                          when building for multiple
                                          architectures

docs/ko/manuals/bob.md

@@ -111,9 +111,8 @@ usage: bob [options] [commands]
  -tp,--texture-profiles <arg>            DEPRECATED! Use
                                          --texture-compression instead
  -u,--auth <arg>                         User auth token
-    --use-async-build-server             Use an async build process for
-                                         the build server (when using
-                                         native extensions)
+    --use-async-build-server             DEPRECATED! Asynchronous build
+                                         is now the default.
     --use-lua-bytecode-delta             Use byte code delta compression
                                          when building for multiple
                                          architectures

docs/ru/manuals/bob.md

@@ -113,9 +113,8 @@ usage: bob [options] [commands]
  -tp,--texture-profiles <arg>            DEPRECATED! Use
                                          --texture-compression instead
  -u,--auth <arg>                         User auth token
-    --use-async-build-server             Use an async build process for
-                                         the build server (when using
-                                         native extensions)
+    --use-async-build-server             DEPRECATED! Asynchronous build
+                                         is now the default.
     --use-lua-bytecode-delta             Use byte code delta compression
                                          when building for multiple
                                          architectures

docs/zh/manuals/bob.md

@@ -81,7 +81,8 @@ usage: bob [options] [commands]
 -tc,--texture-compression <arg>         使用纹理档案中指定的纹理压缩
 -tp,--texture-profiles <arg>            已弃用! 使用 --texture-compression 代替
 -u,--auth <arg>                         用户认证令牌
-   --use-async-build-server             为编译服务器启用异步编译处理 (使用原生扩展时)
+   --use-async-build-server             DEPRECATED! Asynchronous build
+                                         is now the default.
    --use-lua-bytecode-delta             为多平台编译时使用字节码 delta 压缩
    --use-uncompressed-lua-source        使用未压缩未加密的明文Lua源代码代替二进制文件
    --use-vanilla-lua                    已弃用! 使用 --use-uncompressed-lua-source 代替