feat: document more error codes for Accelerate (#5481)

Co-authored-by: Nikolas <[email protected]>

content/400-reference/200-api-reference/250-error-reference.mdx

@@ -525,6 +525,22 @@ Interactive transaction error:
 
 Accelerate-related errors start with `P6xxx`.
 
+#### <inlinecode>P6000</inlinecode> (<inlinecode>ServerError</inlinecode>)
+
+Generic error to catch all other errors.
+
+#### <inlinecode>P6001</inlinecode> (<inlinecode>InvalidDataSource</inlinecode>)
+
+The URL is malformed; for instance, it does not use the `prisma://` protocol.
+
+#### <inlinecode>P6002</inlinecode> (<inlinecode>Unauthorized</inlinecode>)
+
+The API Key in the connection string is invalid.
+
+#### <inlinecode>P6003</inlinecode> (<inlinecode>PlanLimitReached</inlinecode>)
+
+The included usage of the current plan has been exceeded. This can only occur on the [free plan](https://www.prisma.io/pricing).
+
 #### <inlinecode>P6004</inlinecode> (<inlinecode>QueryTimeout</inlinecode>)
 
 The global timeout of Accelerate has been exceeded. You can find the limit [here](/data-platform/accelerate/limitations#query-timeout-limit).
@@ -533,6 +549,14 @@ The global timeout of Accelerate has been exceeded. You can find the limit [here
 
 The user supplied invalid parameters. Currently only relevant for transaction methods. For example, setting a timeout that is too high. You can find the limit [here](/data-platform/accelerate/limitations#interactive-transactions-query-timeout-limit).
 
+#### <inlinecode>P6006</inlinecode> (<inlinecode>VersionNotSupported</inlinecode>)
+
+The chosen Prisma version is not compatible with Accelerate. This may occur when a user uses an unstable development version that we occasionally prune.
+
+#### <inlinecode>P6008</inlinecode> (<inlinecode>ConnectionError|EngineStartError</inlinecode>)
+
+The engine failed to start. For example, it couldn't establish a connection to the database.
+
 #### <inlinecode>P6009</inlinecode> (<inlinecode>ResponseSizeLimitExceeded</inlinecode>)
 
 The global response size limit of Accelerate has been exceeded. You can find the limit [here](/data-platform/accelerate/limitations#response-size-limit).