Update auto-curseforge docs wording around version pinning. (#3344)

Author: gregops

docs/types-and-platforms/mod-platforms/auto-curseforge.md

@@ -56,9 +56,9 @@ For example:
 -e TYPE=AUTO_CURSEFORGE -e CF_SLUG=all-the-mods-8
 ```
 
-### Using specific file version
+### Pinning modpack and mod loader versions
 
-The latest file will be located and used by default, but if a specific version is desired you can use one of the following options. With any of these options **do not select a server file** -- they lack the required manifest and defeat the ability to consistently automate startup.
+The latest modpack file and its associated mod loader will be located and installed by default on startup (including automatic upgrading of both on subsequent startups, if a later version is found on CurseForge). If a specific version is desired instead, you can use one of the following options. With any of these options **do not select a server file** -- they lack the required manifest and defeat the ability to consistently automate startup.
 
 - Use `CF_PAGE_URL`, but include the full URL to a specific file
 - Set `CF_FILE_ID` to the numerical file ID
@@ -84,6 +84,8 @@ The following examples all refer to version 1.0.7 of ATM8:
   CF_FILENAME_MATCHER: 1.0.7
 ```
 
+Pinning modpack version also pins the mod loader (to the version specified by the modpack). Mod loader version cannot be pinned independently of the modpack.
+
 ## Manual Downloads
 
 For mod, modpacks, and world files that are not allowed for automated download, the container path `/downloads` can be attached and matching files will be retrieved from there. The subdirectories `mods`, `modpacks`, and `worlds` will also be checked accordingly. To change the source location of downloaded files, set `CF_DOWNLOADS_REPO` to an existing container path. To disable this feature, set `CF_DOWNLOADS_REPO` to an empty string.