docs: add nerdctl manifest rm reference

add nerdctl manifest rm reference

Signed-off-by: ChengyuZhu6 <hudson@cyzhu.com>

Author: ChengyuZhu6

docs/command-reference.md

@@ -55,6 +55,7 @@ It does not necessarily mean that the corresponding features are missing in cont
   - [:whale: nerdctl manifest annotate](#whale-nerdctl-manifest-annotate)
   - [:whale: nerdctl manifest create](#whale-nerdctl-manifest-create)
   - [:whale: nerdctl manifest inspect](#whale-nerdctl-manifest-inspect)
+  - [:whale: nerdctl manifest rm](#whale-nerdctl-manifest-rm)
 - [Registry](#registry)
   - [:whale: nerdctl login](#whale-nerdctl-login)
   - [:whale: nerdctl logout](#whale-nerdctl-logout)
@@ -1102,6 +1103,18 @@ nerdctl manifest inspect alpine:3.22.1
 nerdctl manifest inspect alpine@sha256:eafc1edb577d2e9b458664a15f23ea1c370214193226069eb22921169fc7e43f
 ```
 
+### :whale: nerdctl manifest rm
+
+Remove one or more index/manifest lists.
+
+Usage: `nerdctl manifest rm INDEX/MANIFESTLIST [INDEX/MANIFESTLIST...]`
+
+Example:
+
+```bash
+nerdctl manifest rm alpine:3.22.1 alpine:3.22.2
+```
+
 ## Registry
 
 ### :whale: nerdctl login