Do not put a link to HPC-GAP manual

It is only available if GAP is compiled with HPC-GAP support, otherwise the cross-reference is unresolved.
gap-system · Feb 29, 2020 · 0cf2f1a · 0cf2f1a
1 parent 2bd8095
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diff --git a/doc/ref/preface.xml b/doc/ref/preface.xml
@@ -18,8 +18,11 @@ Welcome to &GAP;.
 This is one of the manuals documenting the core part of &GAP;,
 the others being the <E>&GAP; Tutorial</E>
 <Alt Only="HTML">(see <Ref BookName="tut" Label="Preface"/>)</Alt>
-and  <E>HPC-GAP Reference Manual</E>
+and <E>HPC-GAP Reference Manual</E>.
+<!--
 <Alt Only="HTML">(see <Ref BookName="hpc" Label="Tasks"/>)</Alt>.
+-->
+<P/>
 
 There is also a document <F>CHANGES.md</F> on the 
 changes from earlier versions in the root directory.

diff --git a/doc/tut/preface.xml b/doc/tut/preface.xml
@@ -28,7 +28,9 @@ In addition to this manual, there are <E>&GAP; Reference Manual</E>
 containing detailed documentation of the mathematical functionality of &GAP;,
 and
 <E>HPC-GAP Reference Manual</E>
+<!--
 <Alt Only="HTML">(see <Ref BookName="hpc" Label="Tasks"/>)</Alt>
+-->
 documenting a multi-threaded version of GAP.
 <P/>