[SPARK-33796][DOCS][FOLLOWUP] Tweak the width of left-menu of Spark SQL Guide #31091
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What changes were proposed in this pull request?
This PR tweaks the width of left-menu of Spark SQL Guide.

When I view the Spark SQL Guide with browsers on macOS, the title
Spark SQL Guidelooks prettily.But I often use Pop!_OS, an Ubuntu variant, and the title is overlapped with browsers on it.
After this change, the title is no longer overlapped.

Why are the changes needed?
For the pretty layout.
Does this PR introduce any user-facing change?
No.
How was this patch tested?
Built the document with
cd docs && SKIP_API=1 jekyll buildand confirmed the layout.