Documentation: virt/kvm/api: eliminate duplicated word

Drop the duplicated word "struct".
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: linux-doc@vger.kernel.org
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: kvm@vger.kernel.org
Link: https://lore.kernel.org/r/20200707180414.10467-21-rdunlap@infradead.orgSigned-off-by: Jonathan Corbet <corbet@lwn.net>

Documentation/virt/kvm/api.rst

@@ -3147,7 +3147,7 @@ Possible features:
 :Capability: basic
 :Architectures: arm, arm64
 :Type: vm ioctl
-:Parameters: struct struct kvm_vcpu_init (out)
+:Parameters: struct kvm_vcpu_init (out)
 :Returns: 0 on success; -1 on error
 
 Errors: