Update Rtc.md

Fix capitalization and link.

Author: Amanda Butler

docs/reference/api/platform/Rtc.md

@@ -1,8 +1,8 @@
 ## RTC
 
-The RTC (Real-Time Clock) Class provides mechanisms to set the current time of the hardware RTC with `set_time` API. The time is set as an offset measured in seconds from the time epoch (Unix Epoch - January 1, 1970). 
+The RTC (Real-Time Clock) class provides mechanisms to set the current time of the hardware RTC with `set_time` API. The time is set as an offset measured in seconds from the time epoch (Unix Epoch - January 1, 1970). 
 
-You can use the `attach_rtc` API to hook external RTC for using C time functions. It provides you with `init()`, `read()`, `write()` and `isenabled()` functions to be attached. [Time](/docs/v5.6/reference/time.html) provides more information about C `date` and `time` standard library functions.
+You can use the `attach_rtc` API to hook external RTC for using C time functions. It provides you with `init()`, `read()`, `write()` and `isenabled()` functions to be attached. <a href="/docs/v5.6/reference/time.html" target="_blank">Time</a> provides more information about C `date` and `time` standard library functions.
 
 RTC class APIs are thread safe.