Remove reference to migration guide

Author: mjhenkes

packages/driver/src/cypress/error_messages.ts

@@ -1657,8 +1657,7 @@ export default {
       if (experimentalSessionSupport) {
         return {
           message: stripIndent`
-          ${cmd('session')} requires enabling the \`experimentalSessionAndOrigin\` flag. The \`experimentalSessionSupport\` flag was enabled but was removed in Cypress version 9.6.0. Please see the migration guide for updating.`,
-          docsUrl: 'https://on.cypress.io/migration-guide',
+          ${cmd('session')} requires enabling the \`experimentalSessionAndOrigin\` flag. The \`experimentalSessionSupport\` flag was enabled but was removed in Cypress version 9.6.0.`,
         }
       }
 

system-tests/projects/e2e/cypress/integration/session_spec.js

@@ -773,7 +773,7 @@ describe('errors', () => {
 
   it('throws error when experimentalSessionSupport is enabled through test config', { experimentalSessionAndOrigin: false, experimentalSessionSupport: true }, (done) => {
     cy.on('fail', ({ message }) => {
-      expect(message).contain('\`cy.session()\` requires enabling the \`experimentalSessionAndOrigin\` flag. The \`experimentalSessionSupport\` flag was enabled but was removed in Cypress version 9.6.0. Please see the migration guide for updating.')
+      expect(message).contain('\`cy.session()\` requires enabling the \`experimentalSessionAndOrigin\` flag. The \`experimentalSessionSupport\` flag was enabled but was removed in Cypress version 9.6.0.')
       done()
     })
 
@@ -784,7 +784,7 @@ describe('errors', () => {
     Cypress.config('experimentalSessionSupport', true)
 
     cy.on('fail', ({ message }) => {
-      expect(message).contain('\`cy.session()\` requires enabling the \`experimentalSessionAndOrigin\` flag. The \`experimentalSessionSupport\` flag was enabled but was removed in Cypress version 9.6.0. Please see the migration guide for updating.')
+      expect(message).contain('\`cy.session()\` requires enabling the \`experimentalSessionAndOrigin\` flag. The \`experimentalSessionSupport\` flag was enabled but was removed in Cypress version 9.6.0.')
       done()
     })