Remove caveat for ROCm 7 (#29025)

Removes the caveat for ROCm 7, since we have fixed all the issues

[Not reviewed - trivial]

Author: jabraham17

doc/rst/technotes/gpu.rst

@@ -170,17 +170,13 @@ The following are further requirements for GPU support:
   * For ROCm 5.x, ``CHPL_LLVM`` must be set to ``system``. Note that, ROCm
     installations come with LLVM. Setting ``CHPL_LLVM=system`` will allow you to
     use that LLVM. Note that ROCm 5.x is not actively tested and we recommend
-    using ROCm 6.3.
+    using ROCm 7.
 
   * For ROCm 6.3, only LLVM 21 is supported. Note that ROCm 6.x is not
     actively tested.
 
   * For ROCm 7.x, only LLVM 21+ is supported.
 
-    .. note:: ROCm 7.x and LLVM 22 do not currently support the ``--fast`` flag,
-      making this configuration unsuitable for workflows requiring high
-      performance. See `this GitHub issue <https://github.com/chapel-lang/chapel/issues/28955>`_ for more information.
-
 * Specifically for using the `CPU-as-Device mode`_:
 
   * ``CHPL_GPU=cpu`` must be explicitly set. In other words, Chapel will not