fixing some errors from nextjs-source-map-updates branch

[sfanahata]

DESCRIBE YOUR PR

• Fix enabled/disabled typo
• Make clear that default: true is the default
• Make clearer that source maps options are optional for set-up

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[sfanahata]

@chargome - adding the fixes I missed on the nextjs source maps repo.

[codecov]

Bundle Report

Changes will increase total bundle size by 180 bytes (0.0%) ⬆️. This is within the configured threshold ✅

Detailed changes

Bundle name	Size	Change
sentry-docs-client-array-push	9.85MB	-6 bytes (-0.0%) ⬇️
sentry-docs-server-cjs	12.26MB	186 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	879.71kB	-0.0%
static/chunks/1831-*.js	-3 bytes	422.23kB	-0.0%
server/middleware-*.js	-5.55kB	1.0kB	-84.74%
server/middleware-*.js	5.55kB	6.55kB	555.3% ⚠️
static/RkcLbZq6XPN2jAOxFhW2K/_buildManifest.js (New)	684 bytes	684 bytes	100.0% 🚀
static/RkcLbZq6XPN2jAOxFhW2K/_ssgManifest.js (New)	77 bytes	77 bytes	100.0% 🚀
static/ArR_RJs_UE6kebFdtMqx_/_buildManifest.js (Deleted)	-684 bytes	0 bytes	-100.0% 🗑️
static/ArR_RJs_UE6kebFdtMqx_/_ssgManifest.js (Deleted)	-77 bytes	0 bytes	-100.0% 🗑️

view changes for bundle: sentry-docs-server-cjs

Assets Changed:

Asset Name	Size Change	Total Size	Change (%)
1729.js	-3 bytes	1.75MB	-0.0%
../instrumentation.js	-3 bytes	1.08MB	-0.0%
9523.js	-3 bytes	1.05MB	-0.0%
../app/[[...path]]/page.js.nft.json	65 bytes	730.07kB	0.01%
../app/platform-redirect/page.js.nft.json	65 bytes	729.98kB	0.01%
../app/sitemap.xml/route.js.nft.json	65 bytes	727.46kB	0.01%

[chargome]

Sorry I just find the wording confusing :D

The disable option disables sourcemaps. This option is false by default (sourcemaps are uploaded per default).