Remove backticks without clear purpose from docs (#6442)

#### Description

- Removed two backticks surrounding the phrase "chat messages as"
- This phrase stood out among other formatted words/phrases such as
`prompt`, `role`, `PromptTemplate`, etc., which all seem to have a clear
function.
- `chat messages as`, formatted as such, confused me while reading,
leading me to believe the backticks were misplaced.

#### Who can review?

@hwchase17
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docs/snippets/modules/model_io/prompts/prompt_templates/get_started.mdx

@@ -69,7 +69,7 @@ You can create custom prompt templates that format the prompt in any way you wan
 
 ## Chat prompt template
 
-[Chat Models](../models/chat) take a list of `chat messages as` input - this list commonly referred to as a `prompt`.
+[Chat Models](../models/chat) take a list of chat messages as input - this list commonly referred to as a `prompt`.
 These chat messages differ from raw string (which you would pass into a [LLM](/docs/modules/model_io/models/llms) model) in that every message is associated with a `role`.
 
 For example, in OpenAI [Chat Completion API](https://platform.openai.com/docs/guides/chat/introduction), a chat message can be associated with the AI, human or system role. The model is supposed to follow instruction from system chat message more closely.