docs/zh_CN: Fix malformed table

Running "make htmldocs" generates the following build error
in zh_CN/cpu-freq/cpu-drivers.rst:

Documentation/translations/zh_CN/cpu-freq/cpu-drivers.rst:109: ERROR: Malformed table.

Fix the table formatting to resolve the error.

Signed-off-by: Gopi Krishna Menon <krishnagopi487@gmail.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

Author: gopi487krishna

Documentation/translations/zh_CN/cpu-freq/cpu-drivers.rst

@@ -112,7 +112,7 @@ CPUfreq核心层注册一个cpufreq_driver结构体。
 |                                   |                                      |
 +-----------------------------------+--------------------------------------+
 |policy->cpuinfo.transition_latency | CPU在两个频率之间切换所需的时间，以  |
-|                                   | 纳秒为单位                    |
+|                                   | 纳秒为单位                           |
 |                                   |                                      |
 +-----------------------------------+--------------------------------------+
 |policy->cur                        | 该CPU当前的工作频率(如适用)          |