Undocument some MakeVars in Bazel's BE.

--
MOS_MIGRATED_REVID=87698761
diff --git a/src/main/java/com/google/devtools/build/docgen/templates/be-body.html b/src/main/java/com/google/devtools/build/docgen/templates/be-body.html
index 46e65ce..29c6828 100644
--- a/src/main/java/com/google/devtools/build/docgen/templates/be-body.html
+++ b/src/main/java/com/google/devtools/build/docgen/templates/be-body.html
@@ -169,14 +169,7 @@
 <ul><!--  keep alphabetically sorted  -->
   <li><code>ABI</code>:
     The C++ ABI version; currently "gcc-3.4". </li>
-  <li><code>ABI_GLIBC_VERSION</code>:
-    The minimal version of glibc required for <code>ABI</code>.  For precompiled
-    third_party libraries, this usually represents the version of glibc
-    that was used to compile the library. </li>
 
-  <li><code>GLIBC_VERSION</code>: The version of glibc. </li>
-  <li><code>JAVA_CPU</code>: The Java target architecture's cpu,
-    "k8" by default. </li>
   <li> <code>TARGET_CPU</code>: The target architecture's cpu,
     e.g. "piii" or "k8". </li>
 </ul>