docs: Update first-steps.md. Change router path to src/server/api/routers/post.ts

[dotswing]

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• fix: Update first-steps.md. Change src/server/api/routers/example.ts to src/server/api/routers/post.ts in all languages

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Hey t3-oss/translators!

This PR contains changes to your language. Please review the changes ❤️.

ES: | FR: @Defranos, @joachimjusth, @vdeva | JA: @t6adev, @uehaj | NO: @estubmo, @josephayman | PL: @matibox, @Infiplaya, @PiotrekPKP | PT: @minsk-dev, @Sn0wye, @victoriaquasar, @MattFerreira18, @gilhrpenner | RU: @AmadeusTwi, @ronanru, @JohnBakhmat | ZH-HANS: @fernandoxu, @escwxyz

[c-ehrlich]

thanks :)