Postgres Tuner - Added a parameter

Added a parameter as per [DOCS-1555](https://enterprisedb.atlassian.net/browse/DOCS-1555)

Author: nidhibhammar

advocacy_docs/pg_extensions/pg_tuner/configuring.mdx

@@ -43,6 +43,8 @@ The following custom GUCs control the EDB Postgres Tuner `work_mem` tuning behav
 
 - `edb_pg_tuner.buffer_size` — Maximum query count for tracking statistics. The default is 5000.
 
+- `edb_pg_tuner.container_memory_limit_file_path` — Specifies the path to the file that contains the memory limit set by the container runtime such as Docker or Kubernetes. This file is read by `edb_pg_tuner` to determine the maximum amount of memory available to the database process when running inside a container. Based on this limit, the tuner can generate optimized PostgreSQL configuration recommendations that are container-aware.
+
 ## Recommended GUCs
 
 EDB Postgres Tuner can recommend the following GUCs. The `static` category provides fixed recommendation settings. The `dynamic` category uses specific algorithms to suggest a better setting according to your workload or hardware resources.