Fix documentation for core.trustFolderStat

Update documentation for core.trustFolderStat to highlight that it is
also used when reading the packed-refs file.

Change-Id: I3eac377c3a7f48493abc8ae6d0889ee70a05d24d
Signed-off-by: Kaushik Lingarkar <quic_kaushikl@quicinc.com>
diff --git a/Documentation/config-options.md b/Documentation/config-options.md
index 19bcc33..6551ba8 100644
--- a/Documentation/config-options.md
+++ b/Documentation/config-options.md
@@ -45,7 +45,7 @@
 | `core.streamFileThreshold` | `50 MiB` | &#x20DE; | The size threshold beyond which objects must be streamed. |
 | `core.supportsAtomicFileCreation` | `true` | &#x20DE; | Whether the filesystem supports atomic file creation. |
 | `core.symlinks` | Auto detect if filesystem supports symlinks| &#x2705; | If false, symbolic links are checked out as small plain files that contain the link text. |
-| `core.trustFolderStat` | `true` | &#x20DE; | Whether to trust the pack folder's modification time. If `false` JGit will always scan the `.git/objects/pack` folder to check for new pack files. This can help to workaround caching issues on NFS, but reduces performance. If set to `true` it uses the `lastmodified` attribute of the folder and assumes that no new pack files can be in this folder if its modification time has not changed. |
+| `core.trustFolderStat` | `true` | &#x20DE; | Whether to trust the pack folder's and packed-refs file's file attributes (Java equivalent of stat command on *nix). When looking for pack files, if `false` JGit will always scan the `.git/objects/pack` folder and if set to `true` it assumes that pack files are unchanged if the file attributes of the pack folder are unchanged. When getting the list of packed refs, if `false` JGit will always read the packed-refs file and if set to `true` it uses the file attributes of the packed-refs file and will only read it if a file attribute has changed. Setting this option to `false` can help to workaround caching issues on NFS, but reduces performance.|
 | `core.worktree` | Root directory of the working tree if it is not the parent directory of the `.git` directory | &#x2705; | The path to the root of the working tree. |
 
 ## __gc__ options