docs(user): apply final review fixes

Items B-EffectCraft 1-2.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

docs/user/guides/animate-with-keyframes.md

@@ -9,7 +9,7 @@ Click the stopwatch beside a property to start animating it, move the current-ti
 
 You need a composition with a layer. See [Make your first composition](make-a-composition.md).
 
-Shortcuts on this page use Ctrl. On macOS, use Cmd instead of Ctrl.
+Shortcuts on this page use Ctrl. On macOS, use Cmd instead of Ctrl and Option instead of Alt.
 
 ## Steps
 

docs/user/guides/import-footage.md

@@ -7,7 +7,7 @@ verified: 0.8.0
 
 Choose **File ▸ Import ▸ File...** (Ctrl+I) and pick your files, or drop files on the EffectCraft window. Numbered stills such as `shot_0001.png` can import as one sequence that plays like a movie.
 
-Shortcuts on this page use Ctrl. On macOS, use Cmd instead of Ctrl.
+Shortcuts on this page use Ctrl. On macOS, use Cmd instead of Ctrl and Option instead of Alt.
 
 ## Import files
 

docs/user/guides/render-a-video.md

@@ -7,7 +7,7 @@ verified: 0.8.0
 
 Select the composition, choose **Composition ▸ Add to Render Queue** (Ctrl+M), set the output file, then click **Render** in the Render Queue panel. The default format is H.264, saved as an `.mp4` file named after the composition.
 
-Shortcuts on this page use Ctrl. On macOS, use Cmd instead of Ctrl.
+Shortcuts on this page use Ctrl. On macOS, use Cmd instead of Ctrl and Option instead of Alt.
 
 ## Steps