Docs: Deprecated 'Create session with agent' (#9464)

### What problem does this PR solve?


### Type of change

- [x] Documentation Update

web/src/locales/en.ts

@@ -445,7 +445,7 @@ This auto-tagging feature enhances retrieval by adding another layer of domain-s
       emptyResponseTip: `Set this as a response if no results are retrieved from the knowledge bases for your query, or leave this field blank to allow the LLM to improvise when nothing is found.`,
       emptyResponseMessage: `Empty response will be triggered when nothing relevant is retrieved from knowledge bases. You must clear the 'Empty response' field if no knowledge base is selected.`,
       setAnOpener: 'Opening greeting',
-      setAnOpenerInitial: `Hi! I'm your assistant, what can I do for you?`,
+      setAnOpenerInitial: `Hi! I'm your assistant. What can I do for you?`,
       setAnOpenerTip: 'Set an opening greeting for users.',
       knowledgeBases: 'Knowledge bases',
       knowledgeBasesMessage: 'Please select',

web/src/pages/agent/constant.tsx

@@ -262,7 +262,7 @@ export const initialRetrievalValues = {
 
 export const initialBeginValues = {
   mode: AgentDialogueMode.Conversational,
-  prologue: `Hi! I'm your assistant, what can I do for you?`,
+  prologue: `Hi! I'm your assistant. What can I do for you?`,
 };
 
 export const variableCheckBoxFieldMap = Object.keys(

web/src/pages/flow/constant.tsx

@@ -411,7 +411,7 @@ export const initialRetrievalValues = {
 };
 
 export const initialBeginValues = {
-  prologue: `Hi! I'm your assistant, what can I do for you?`,
+  prologue: `Hi! I'm your assistant. What can I do for you?`,
 };
 
 export const variableCheckBoxFieldMap = Object.keys(