Fix preview-mode docs/examples typo (#11345)

be know => be known

docs/advanced-features/preview-mode.md

@@ -74,7 +74,7 @@ Your headless CMS might allow you to include a variable in the preview URL so th
 ```js
 export default async (req, res) => {
   // Check the secret and next parameters
-  // This secret should only be know to this API route and the CMS
+  // This secret should only be known to this API route and the CMS
   if (req.query.secret !== 'MY_SECRET_TOKEN' || !req.query.slug) {
     return res.status(401).json({ message: 'Invalid token' })
   }

examples/cms-datocms/pages/api/preview.js

@@ -2,7 +2,7 @@ import { getPreviewPostBySlug } from '../../lib/api'
 
 export default async (req, res) => {
   // Check the secret and next parameters
-  // This secret should only be know to this API route and the CMS
+  // This secret should only be known to this API route and the CMS
   if (
     req.query.secret !== process.env.NEXT_EXAMPLE_CMS_DATOCMS_PREVIEW_SECRET ||
     !req.query.slug

examples/cms-sanity/pages/api/preview.js

@@ -2,7 +2,7 @@ import { getPreviewPostBySlug } from '../../lib/api'
 
 export default async (req, res) => {
   // Check the secret and next parameters
-  // This secret should only be know to this API route and the CMS
+  // This secret should only be known to this API route and the CMS
   if (
     req.query.secret !== process.env.NEXT_EXAMPLE_CMS_SANITY_PREVIEW_SECRET ||
     !req.query.slug

examples/cms-takeshape/pages/api/preview.js

@@ -2,7 +2,7 @@ import { getPreviewPostBySlug } from '../../lib/api'
 
 export default async (req, res) => {
   // Check the secret and next parameters
-  // This secret should only be know to this API route and the CMS
+  // This secret should only be known to this API route and the CMS
   if (
     req.query.secret !==
       process.env.NEXT_EXAMPLE_CMS_TAKESHAPE_PREVIEW_SECRET ||