docs(godot): Update before-send examples

[limbonaut]

DESCRIBE YOUR PR

In Godot SDK, update the before_send examples to use exception value instead of message for filtering error events.

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• Checked Vercel preview for correctness, including links
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Project	Deployment	Preview	Comments	Updated (UTC)
sentry-docs	Ready	Preview	Comment	Oct 23, 2025 6:08pm

1 Skipped Deployment

Project	Deployment	Preview	Comments	Updated (UTC)
develop-docs	Ignored			Oct 23, 2025 6:08pm

[limbonaut]

In response to the cursor comment: get_exception_value() returns an empty string when no exception is present. Since Godot does not support nullable types, strings cannot hold null values.

[codecov]

Bundle Report

Changes will decrease total bundle size by 6 bytes (-0.0%) ⬇️. This is within the configured threshold ✅

Detailed changes

Bundle name	Size	Change
sentry-docs-client-array-push	10.16MB	-6 bytes (-0.0%) ⬇️

Affected Assets, Files, and Routes:

view changes for bundle: sentry-docs-client-array-push

Assets Changed:

Asset Name	Size Change	Total Size	Change (%)
static/chunks/pages/_app-*.js	-3 bytes	882.71kB	-0.0%
static/chunks/8321-*.js	-3 bytes	425.87kB	-0.0%
server/middleware-*.js	-6.46kB	1.0kB	-86.59%
server/middleware-*.js	6.46kB	7.46kB	645.5% ⚠️
static/fvSy5_w9wWpxLuiI8jMih/_buildManifest.js (New)	684 bytes	684 bytes	100.0% 🚀
static/fvSy5_w9wWpxLuiI8jMih/_ssgManifest.js (New)	77 bytes	77 bytes	100.0% 🚀
static/oLXxk2UdYPGTn_LOaHvrF/_buildManifest.js (Deleted)	-684 bytes	0 bytes	-100.0% 🗑️
static/oLXxk2UdYPGTn_LOaHvrF/_ssgManifest.js (Deleted)	-77 bytes	0 bytes	-100.0% 🗑️