Use "required argument" style in hostname pattern

It’s not a range and also not optional in this context and the fixed
node name prefix is already in column "Nodes".

doc.zih.tu-dresden.de/docs/jobs_and_resources/overview.md

@@ -54,12 +54,12 @@ The following questions may help to decide which cluster to use
 <!-- cluster_overview_table -->
 |Name|Description| DNS | Nodes | # Nodes | Cores per Node | Threads per Core | Memory per Node [in MB] | Memory per Core [in MB] | GPUs per Node
 |---|---|----|:---|---:|---:|---:|---:|---:|---:|
-|**Capella**<br>_2024_| GPU|`c[node].barnard.hpc.tu-dresden.de` |`c[1-144]` | 144 |64| 1 |768,000 | | 4 |
-|**Barnard**<br>_2023_| CPU|`n[node].barnard.hpc.tu-dresden.de` |`n[1001-1630]` | 630 |104| 2 |515,000 |12,000 | 0 |
-|**Alpha**<br>_2021_| GPU |`i[node].alpha.hpc.tu-dresden.de`|`i[8001-8037]` |  34 | 48 | 2 | 990,000 | 10,312|  8  |
-|**Romeo**<br>_2020_| CPU |`i[node].romeo.hpc.tu-dresden.de`|`i[7001-7192]` | 192|128 | 2 | 505,000| 1,972 |  0  |
+|**Capella**<br>_2024_| GPU|`<node>.barnard.hpc.tu-dresden.de` |`c[1-144]` | 144 |64| 1 |768,000 | | 4 |
+|**Barnard**<br>_2023_| CPU|`<node>.barnard.hpc.tu-dresden.de` |`n[1001-1630]` | 630 |104| 2 |515,000 |12,000 | 0 |
+|**Alpha**<br>_2021_| GPU |`<node>.alpha.hpc.tu-dresden.de`|`i[8001-8037]` |  34 | 48 | 2 | 990,000 | 10,312|  8  |
+|**Romeo**<br>_2020_| CPU |`<node>.romeo.hpc.tu-dresden.de`|`i[7001-7192]` | 192|128 | 2 | 505,000| 1,972 |  0  |
 |**Julia**<br>_2021_| single SMP system |`julia.hpc.tu-dresden.de`| `julia` | 1 | 896 | 1 | 48,390,000 | 54,006 | - |
-|**Power9**<br>_2018_|IBM Power/GPU system |`ml[node].power9.hpc.tu-dresden.de`|`ml[1-29]` | 29 | 44 | 4 | 254,000 | 1,443 | 6 |
+|**Power9**<br>_2018_|IBM Power/GPU system |`<node>.power9.hpc.tu-dresden.de`|`ml[1-29]` | 29 | 44 | 4 | 254,000 | 1,443 | 6 |
 {: summary="cluster overview table" align="bottom"}
 
 ### Interactive or Batch Mode