[MNG-7184] document .mavenrc/mavenrc_pre.bat|cmd and MAVEN_SKIP_RC
[MNG-7184] document .mavenrc/mavenrc_pre.bat|cmd and MAVEN_SKIP_RC
cstamas/maven,mcculls/maven,cstamas/maven,apache/maven,apache/maven,mcculls/maven,cstamas/maven,mcculls/maven,apache/maven