Docs: add warning about MtlManager in the run.md (#1132)

Change the run to inlcude warning about MtlManager as clinets are
oftentimes running into lcore
assigmnet issues which could be avoided by
signaling them to use MtlManager in clear enough
form.

Author: DawidWesierski4

doc/run.md

@@ -144,6 +144,18 @@ The number is dependent on the workloads you wish to execute. Consider increasin
 
 ## 5. Run the Sample Application
 
+> **WARNING:** It is crucial to run the MTL Manager using the Bash command
+> ```bash
+> sudo MtlManager
+> ```
+> before attempting to run more than one MTL process per machine or server.
+>
+> Failure to do so will result in improper logical core (lcore) management, as all MTL
+> processes will allocate on the same cores, leading to severe performance degradation
+> and potential system instability.
+>
+> For detailed instructions and further information, please refer to the [manager/README.md](../manager/README.md)
+
 ### 5.1. Prepare Source Files
 
 Please note that the input YUV source file for the sample application is in the RFC4175 YUV422BE10 (big-endian 10-bit) pixel group format, which is defined in the ST2110 specification. This project includes a simple tool to convert the format from YUV422 planar 10-bit little-endian format.