Updated client JS MD file

Summary:
Updated client JS MD file:

marked processAndCollectAllParams as deprecated

update all reference to processAndCollectAllParams

Reviewed By: ppwang-sa

Differential Revision: D98959753

fbshipit-source-id: 30b4d5dccf0bad56ef9e92e6b440fad98333f66c

Author: Jiaming You

client_js/README.md

@@ -44,38 +44,29 @@ Type the URL http://localhost:3000/?fbclid=test123 — you'll see `fbc` returned
 
 ## API Usage
 
-### processAndCollectParams(url)
-
-Processes and collects `fbc` and `fbp` parameters, saving them into cookies.
-
-```javascript
-const params = clientParamBuilder.processAndCollectParams(url);
-```
-
-- `url` is optional. Returns an object with `_fbc` and `_fbp` values.
-
 ### processAndCollectAllParams(url, getIpFn)
 
-Extended version that also retrieves client IP addresses and backup click IDs from in-app browsers.
+Processes and collects `fbc` and `fbp` parameters (saving them into cookies), and also retrieves client IP addresses and backup click IDs from in-app browsers.
 
 ```javascript
 const params = await clientParamBuilder.processAndCollectAllParams(url, getIpFn);
 ```
 
 - `url` is optional.
 - `getIpFn` is optional — a user-provided function to retrieve client IP addresses.
+- Returns an object with `_fbc`, `_fbp`, and additional parameter values.
 
 ### getFbc()
 
-Returns the `fbc` value from cookie. Call `processAndCollectParams` first.
+Returns the `fbc` value from cookie. Call `processAndCollectAllParams` first.
 
 ```javascript
 const fbc = clientParamBuilder.getFbc();
 ```
 
 ### getFbp()
 
-Returns the `fbp` value from cookie. Call `processAndCollectParams` first.
+Returns the `fbp` value from cookie. Call `processAndCollectAllParams` first.
 
 ```javascript
 const fbp = clientParamBuilder.getFbp();
@@ -100,6 +91,10 @@ const hashedPhone = clientParamBuilder.getNormalizedAndHashedPII('+1 (616) 954-7
 
 Supported `dataType` values: `phone`, `email`, `first_name`, `last_name`, `date_of_birth`, `gender`, `city`, `state`, `zip_code`, `country`, `external_id`.
 
+### processAndCollectParams(url) *(Deprecated)*
+
+> **Deprecated:** Use `processAndCollectAllParams` instead. This method is kept for backward compatibility only.
+
 ## Development
 
 ### Prerequisites