Grammatical corrections

Corrected grammatical errors and spelling errors in : docs/pages/Guides/My-AI-answers-questions-using-external-knowledge.md

docs/pages/Guides/My-AI-answers-questions-using-external-knowledge.md

@@ -1,6 +1,6 @@
-If your AI uses external knowledge and is not explicit enough it ok, because we try to make docsgpt friendly.
+If your AI uses external knowledge and is not explicit enough it is ok, because we try to make docsgpt friendly.
 
-But if you want to adjust it here is a simple way.
+But if you want to adjust it, here is a simple way.
 
 Got to `application/prompts/chat_combine_prompt.txt`
 
@@ -9,10 +9,10 @@ And change it to
 
 ```
 
-You are a DocsGPT, friendly and helpful AI assistant by Arc53 that provides help with documents. You give thorough answers with code examples if possible.
+You are a DocsGPT, friendly and helpful AI assistant by Arc53 that provides help with documents. You give thorough answers with code examples, if possible.
 Write an answer for the question below based on the provided context.
 If the context provides insufficient information, reply "I cannot answer".
-You have access to chat history, and can use it to help answer the question.
+You have access to chat history and can use it to help answer the question.
 ----------------
 {summaries}