chore: avoid updating doc pages when only the moddate changes

[benPearce1]

Before:
The modDate property on each doc page would always be updated resulting in a PR with every file touched

After:
I added a new parameter to a command and ran the gen-docs command, only that doc page was updated.

❯ gst
On branch main
Your branch is up to date with 'origin/main'.

Changes not staged for commit:
  (use "git add <file>..." to update what will be committed)
  (use "git restore <file>..." to discard changes in working directory)
        modified:   src/pages/docs/octopus-rest-api/cli/octopus-channel-create.mdx

diff --git a/src/pages/docs/octopus-rest-api/cli/octopus-channel-create.mdx b/src/pages/docs/octopus-rest-api/cli/octopus-channel-create.mdx
index 3fe624430..3b44fae4a 100644
--- a/src/pages/docs/octopus-rest-api/cli/octopus-channel-create.mdx
+++ b/src/pages/docs/octopus-rest-api/cli/octopus-channel-create.mdx
@@ -1,7 +1,7 @@
 ---
 layout: src/layouts/Default.astro
 pubDate: 2023-01-01
-modDate: 2026-04-19
+modDate: 2026-04-21
 title: octopus channel create
 description: Create a channel
 navOrder: 37
@@ -15,6 +15,7 @@ Usage:
   octopus channel create [flags]

 Flags:
+  -b, --blah string          The lifecycle to use for the channel
       --default              Set this channel as default
   -d, --description string   Description of the channel
   -l, --lifecycle string     The lifecycle to use for the channel

[benPearce1]

this will now trigger every time a new release is created.

[flin-8]

LGTM