[MINOR] fix(doc): fix docs build issue (#5579)

### What changes were proposed in this pull request?
fix docs `name undefined` issue

### Why are the changes needed?
N/A

### Does this PR introduce _any_ user-facing change?
N/A

### How was this patch tested?
N/A

docs/gravitino-server-config.md

@@ -169,7 +169,7 @@ The Formatter defines an interface that formats metadata audit logs into a unifi
 
 The `AuditLogWriter` defines an interface that enables the writing of metadata audit logs to different storage mediums such as files, databases, etc.
 
-Writer configuration begins with `gravitino.audit.writer.${name}`, where ${name} is replaced with the actual writer name defined in method `name()`. `FileAuditWriter` is a default implement to log audit information, whose name is `file`.
+Writer configuration begins with `gravitino.audit.writer.${name}`, where `${name}` is replaced with the actual writer name defined in method `name()`. `FileAuditWriter` is a default implement to log audit information, whose name is `file`.
 
 | Property name                                   | Description                                                                   | Default value       | Required | Since Version    |
 |-------------------------------------------------|-------------------------------------------------------------------------------|---------------------|----------|------------------|