revert white-space changes in docs (#12557)

### What problem does this PR solve?

Trailing white-spaces in commit 6814ace1aa
got automatically trimmed by code editor may causes documentation
typesetting broken.

Mostly for double spaces for soft line breaks.  

### Type of change

- [x] Documentation Update

docs/guides/agent/agent_component_reference/retrieval.mdx

@@ -5,7 +5,6 @@ sidebar_custom_props: {
   categoryIcon: LucideFolderSearch
 }
 ---
-
 # Retrieval component
 
 A component that retrieves information from specified datasets.
@@ -24,13 +23,13 @@ Ensure you [have properly configured your target dataset(s)](../../dataset/confi
 
 ## Quickstart
 
-### 1. Click on a **Retrieval** component to show its configuration panel
+### 1. Click on a **Retrieval** component to show its configuration panel  
 
 The corresponding configuration panel appears to the right of the canvas. Use this panel to define and fine-tune the **Retrieval** component's search behavior.
 
 ### 2. Input query variable(s)
 
-The **Retrieval** component depends on query variables to specify its queries.
+The **Retrieval** component depends on query variables to specify its queries. 
 
 :::caution IMPORTANT
 - If you use the **Retrieval** component as a standalone workflow module, input query variables in the **Input Variables** text box.
@@ -77,7 +76,7 @@ Select the query source for retrieval. Defaults to `sys.query`, which is the def
 
 The **Retrieval** component relies on query variables to specify its queries. All global variables defined before the **Retrieval** component can also be used as queries. Use the `(x)` button or type `/` to show all the available query variables.
 
-### Knowledge bases
+### Knowledge bases 
 
 Select the dataset(s) to retrieve data from.
 
@@ -113,7 +112,7 @@ Using a rerank model will *significantly* increase the system's response time.
 
 ### Empty response
 
-- Set this as a response if no results are retrieved from the dataset(s) for your query, or
+- Set this as a response if no results are retrieved from the dataset(s) for your query, or 
 - Leave this field blank to allow the chat model to improvise when nothing is found.
 
 :::caution WARNING