pages.*: sync page titles (#12734)

Co-authored-by: Reinhart Previano Koentjoro <reinhart_previano@yahoo.com>
Co-authored-by: Lena <126529524+acuteenvy@users.noreply.github.com>
Co-authored-by: spageektti <155078792+spageektti@users.noreply.github.com>
Co-authored-by: Fazle Arefin <fazlearefin@users.noreply.github.com>
Co-authored-by: Allie <allie@cloverleaf.app>

pages.zh/common/gnmic-sub.md

@@ -1,4 +1,4 @@
-# gnmic-sub
+# gnmic sub
 
 > 这是 `gnmic subscribe` 命令的一个别名。
 > 更多信息：<https://gnmic.kmrd.dev/cmd/subscribe>.