list sent params in README Conversions API step

Summary:
The "Send ... to the Conversions API" step in each SDK README only said "Send fbc and fbp", which no longer reflects what the example payload sends. Reword the step heading in all five READMEs to list the actual parameters and their Conversions API placement: `event_source_url` and `referrer_url` at the event level, and `fbc` / `fbp` (plus `client_ip_address`, `em`, `ph` for the NodeJS and PHP SDKs, which also expose client-IP and hashed-PII getters) inside `user_data`. The example payload bodies are unchanged — only the step heading was inaccurate.

Java, Python, and Ruby expose only `fbc` / `fbp`, so their headings list just those under `user_data`; NodeJS and PHP additionally list `client_ip_address`, `em`, and `ph`, matching their richer getter set.

___

Differential Revision: D107944008

fbshipit-source-id: c00dad9e3596afab82db2b53fba31ee1883837f6

Author: Jiaming You

java/README.md

@@ -207,7 +207,9 @@ String eventSourceUrl = paramBuilder.getEventSourceUrl();
 String referrerUrl = paramBuilder.getReferrerUrl();
 ```
 
-7. Send fbc and fbp back to the Conversions API.
+7. Send the parameters back to the Conversions API. `event_source_url` and
+   `referrer_url` are sent at the event level; `fbc` and `fbp` are sent inside
+   `user_data`.
 
 ```
 data=[

nodejs/README.md

@@ -197,8 +197,9 @@ API is to get normalized and hashed (sha256) PII from input piiValue, supported
 
 ```
 
-6. Send fbc, fbp, client_ip_address, email and phone back through Conversions
-   API under UserData section:
+6. Send the parameters back to the Conversions API. `event_source_url` and
+   `referrer_url` are sent at the event level; `fbc`, `fbp`, `client_ip_address`,
+   `em` (email) and `ph` (phone) are sent inside `user_data`:
 
 ```
 data=[

php/README.md

@@ -220,8 +220,9 @@ API is to get normalized and hashed (sha256) PII from input piiValue, supported
 
 ```
 
-6. Send fbc, fbp, client_ip_address, email and phone back through Conversions
-   API.
+6. Send the parameters back to the Conversions API. `event_source_url` and
+   `referrer_url` are sent at the event level; `fbc`, `fbp`, `client_ip_address`,
+   `em` (email) and `ph` (phone) are sent inside `user_data`.
 
 ```
 data=[

python/README.md

@@ -153,7 +153,9 @@ event_source_url = paramBuilder.get_event_source_url()
 referrer_url = paramBuilder.get_referrer_url()
 ```
 
-7. Send fbc and fbp back with Conversion API.
+7. Send the parameters back to the Conversions API. `event_source_url` and
+   `referrer_url` are sent at the event level; `fbc` and `fbp` are sent inside
+   `user_data`.
 
 ```
 data=[

ruby/README.md

@@ -207,7 +207,9 @@ referrer_url = builder.get_referrer_url()
 
 ```
 
-7. Send fbc and fbp back with the Conversions API.
+7. Send the parameters back to the Conversions API. `event_source_url` and
+   `referrer_url` are sent at the event level; `fbc` and `fbp` are sent inside
+   `user_data`.
 
 ```