Don't reference CRC docs on master.

Seems the quickbook docs for CRC only exist on develop. not master. So we can't reference them here.

doc/Jamfile.v2

@@ -56,8 +56,8 @@ boostbook doc
     <dependency>../libs/accumulators/doc//accumulators
     <dependency>../libs/circular_buffer/doc//standalone/<format>docbook
     <dependency>../libs/lexical_cast/doc//lexical_cast
-    <dependency>../libs/crc/doc//crc
-    <dependency>../libs/crc/doc//autodoc.xml
+    #<dependency>../libs/crc/doc//crc
+    #<dependency>../libs/crc/doc//autodoc.xml
     <dependency>../libs/chrono/doc//chrono
     <dependency>../libs/dll/doc//dll-doc
     <dependency>../libs/program_options/doc//autodoc.xml
@@ -110,7 +110,7 @@ boostbook doc
     <implicit-dependency>../libs/accumulators/doc//accumulators
     <implicit-dependency>../libs/chrono/doc//chrono
     <implicit-dependency>../libs/lexical_cast/doc//lexical_cast
-    <implicit-dependency>../libs/crc/doc//crc
+    #<implicit-dependency>../libs/crc/doc//crc
     <implicit-dependency>../libs/dll/doc//dll-doc
     <implicit-dependency>../libs/functional/hash/doc//hash
     #<implicit-dependency>../libs/type_traits/doc//type_traits