[#2980] addressed comments

doc/sphinx/arm/hooks-radius.rst

@@ -297,7 +297,7 @@ the following:
      Valgrind:                  no
      C++ Code Coverage:         no
      Logger checks:             no
-     Install existing manuals:  yes
+     Install existing manuals:  no
      Generate Documentation:    no
      Generate Parser:           no
      Generate Messages Files:   no

doc/sphinx/arm/install.rst

@@ -154,8 +154,6 @@ the system:
 -  log4cplus (at least version 1.0.3) development include headers.
 
 -  A C++ compiler (with C++14 support) and standard development headers.
-   The Kea build has been checked with GCC g++ 4.8.5 and some later versions,
-   and Clang 800.0.38 and some later versions.
 
 -  The development tools automake, libtool, and pkg-config.
 

platforms.rst

@@ -7,9 +7,6 @@ In general, this version of Kea builds and runs on any POSIX-compliant
 system with a C++ compiler (with C++14 support), the Botan cryptographic library,
 the log4cplus logging library and the Boost system library.
 
-The Kea build has been checked with GCC g++ 4.8.5 and some later versions,
-and Clang 800.0.38 and some later versions.
-
 ISC regularly tests Kea on many operating systems and architectures, but
 lacks the resources to test all of them. Consequently, ISC is only able to
 offer support on a "best-effort" basis for some.