compose-file v2: re-order topics to be the same as v3

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

compose/compose-file/compose-file-v2.md

@@ -143,20 +143,6 @@ image: webapp:tag
 
 This results in an image named `webapp` and tagged `tag`, built from `./dir`.
 
-#### cache_from
-
-> Added in [version 2.2](compose-versioning.md#version-22) file format
-
-A list of images that the engine uses for cache resolution.
-
-```yaml
-build:
-  context: .
-  cache_from:
-    - alpine:latest
-    - corp/web_app:3.14
-```
-
 #### context
 
 > [Version 2 file format](compose-versioning.md#version-2) and up. In version 1, just use
@@ -242,6 +228,20 @@ args:
 > **Note**: YAML boolean values (`true`, `false`, `yes`, `no`, `on`, `off`) must
 > be enclosed in quotes, so that the parser interprets them as strings.
 
+#### cache_from
+
+> Added in [version 2.2](compose-versioning.md#version-22) file format
+
+A list of images that the engine uses for cache resolution.
+
+```yaml
+build:
+  context: .
+  cache_from:
+    - alpine:latest
+    - corp/web_app:3.14
+```
+
 #### extra_hosts
 
 Add hostname mappings at build-time. Use the same values as the docker client `--add-host` parameter.
@@ -367,6 +367,14 @@ cap_drop:
   - SYS_ADMIN
 ```
 
+### cgroup_parent
+
+Specify an optional parent cgroup for the container.
+
+```yaml
+cgroup_parent: m-executor-abcd
+```
+
 ### command
 
 Override the default command.
@@ -382,14 +390,6 @@ The command can also be a list, in a manner similar to
 command: ["bundle", "exec", "thin", "-p", "3000"]
 ```
 
-### cgroup_parent
-
-Specify an optional parent cgroup for the container.
-
-```yaml
-cgroup_parent: m-executor-abcd
-```
-
 ### container_name
 
 Specify a custom container name, rather than a generated default name.
@@ -548,19 +548,6 @@ dns_search:
   - dc2.example.com
 ```
 
-### tmpfs
-
-Mount a temporary file system inside the container. Can be a single value or a list.
-
-```yaml
-tmpfs: /run
-```
-```yaml
-tmpfs:
-  - /run
-  - /tmp
-```
-
 ### entrypoint
 
 Override the default entrypoint.
@@ -1359,6 +1346,20 @@ sysctls:
   - net.ipv4.tcp_syncookies=0
 ```
 
+### tmpfs
+
+Mount a temporary file system inside the container. Can be a single value or a list.
+
+```yaml
+tmpfs: /run
+```
+
+```yaml
+tmpfs:
+  - /run
+  - /tmp
+```
+
 ### ulimits
 
 Override the default ulimits for a container. You can either specify a single