added caveats to use of installer script

Author: lstein

docs/installation/INSTALL_INVOKE.md

@@ -12,6 +12,15 @@ potentially unstable new features, you should consider using the
 [source installer](INSTALL_SOURCE.md) or one of the
 [manual install](INSTALL_MANUAL.md) methods.
 
+**Important Caveats**
+  - This script does not support AMD GPUs. For Linux AMD support,
+    please use the manual or source code installer methods.
+
+  - This script has difficulty on some Macintosh machines
+    that have previously been used for Python development due to
+    conflicting development tools versions. Mac developers may wish
+    to try the source code installer or one of the manual methods instead.
+
 !!! todo
 
     Before you begin, make sure that you meet

docs/installation/index.md

@@ -16,10 +16,13 @@ experience and preferences.
     work", don't have an interest in tinkering with it, and do not
     care about upgrading to unreleased experimental features.
 
-    *Note that this script has difficulty on some Macintosh machines
+    **Important Caveats**
+    - This script does not support AMD GPUs. For Linux AMD support,
+    please use the manual or source code installer methods.
+    - This script has difficulty on some Macintosh machines
     that have previously been used for Python development due to
     conflicting development tools versions. Mac developers may wish
-    to try method (2) or one of the manual methods instead.
+    to try the source code installer or one of the manual methods instead.
 
 2. [Source code installer](INSTALL_SOURCE.md)