Remove mentions of RC in upgrade docs

Author: pwizla

docusaurus/docs/dev-docs/migration/v4-to-v5/introduction-and-faq.md

@@ -8,7 +8,6 @@ tags:
 ---
 
 import DoNotMigrateYet from '/docs/snippets/_do-not-migrate-to-v5-yet.md'
-import TempUpgradeRCtag from '/docs/snippets/temp-upgrade-rc.md'
 const detailsStyle = {backgroundColor: 'transparent', border: 'solid 1px #4945ff' }
 const summaryStyle = {fontSize: '18px'}
 const codeStyle = {color: 'rgb(73, 69, 255)', backgroundColor: 'rgb(240, 240, 255)'}

docusaurus/docs/dev-docs/migration/v4-to-v5/step-by-step.md

@@ -9,7 +9,6 @@ tags:
 ---
 
 import DoNotMigrateYet from '/docs/snippets/_do-not-migrate-to-v5-yet.md'
-import TempUpgradeRCtag from '/docs/snippets/temp-upgrade-rc.md'
 const detailsStyle = {backgroundColor: 'transparent', border: 'solid 1px #4945ff' }
 const summaryStyle = {fontSize: '18px'}
 
@@ -54,18 +53,6 @@ Strapi provides a tool to automate some parts of the upgrade to Strapi 5: the [u
   npx @strapi/upgrade major
   ```
 
-  <details>
-  <summary>⚠️ Upgrading while Strapi 5 is in RC:</summary>
-  <p><strong>Warning</strong>: It is not recommended to migrate a production-level project to Strapi 5 before the release of the stable version. Migrate to Strapi 5 release candidate (RC) at your own risk.</p>
-
-  As long as Strapi 5 is available as a RC, the proper command to upgrade is different and depends on the RC version you want to reach. For instance, to reach Strapi 5.0.0-rc.6, the command is:
-
-  ```sh
-  npx @strapi/upgrade@rc to 5.0.0-rc.6 -c 5.0.0
-  ```
-
-  </details>
-
   The command will execute the update and installation of the dependencies of Strapi 5, and run the codemods to handle some of the breaking changes that come with Strapi 5.
 
   The codemods will handle the following changes: