Update resource_allocation_and_job_execution.md

docs.it4i/general/resource_allocation_and_job_execution.md

@@ -2,7 +2,7 @@
     We migrated workload managers of all clusters (including Barbora and Karolina) **from PBS to Slurm**!
     For more information on how to submit jobs in Slurm, see the [Job Submission and Execution][5] section.
 
-# Introduction to Running Jobs
+# How to Run Jobs
 
 ## Job Submission and Execution
 
@@ -26,7 +26,7 @@ Resources are allocated to the job in a fair-share fashion, subject to constrain
 
 Read more on the [Resource Allocation Policy][4] page.
 
-### Resource Reservation
+## Resource Reservation
 
 You can request a reservation of a specific number, range, or type of computational resources at [support@it4i.cz][c].
 Note that unspent reserved node-hours count towards the total computational resources used.