cpupower: Replace a dead reference link with working ones

Replace a dead reference link to a turbo boost technology description with
a reference to a root page of the technology on the Intel site, and add
another one, describing power management technology, which includes short
description of the turbo boost.

Signed-off-by: Roman Storozhenko <romeusmeister@gmail.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>

Author: Romeus

tools/power/cpupower/man/cpupower-monitor.1

@@ -172,9 +172,11 @@ displayed.
 "BIOS and Kernel Developer’s Guide (BKDG) for AMD Family 14h Processors"
 https://support.amd.com/us/Processor_TechDocs/43170.pdf
 
-"Intel® Turbo Boost Technology
-in Intel® Core™ Microarchitecture (Nehalem) Based Processors"
-http://download.intel.com/design/processor/applnots/320354.pdf
+"What Is Intel® Turbo Boost Technology?"
+https://www.intel.com/content/www/us/en/gaming/resources/turbo-boost.html
+
+"Power Management - Technology Overview"
+https://cdrdv2.intel.com/v1/dl/getContent/637748
 
 "Intel® 64 and IA-32 Architectures Software Developer's Manual
 Volume 3B: System Programming Guide"