[NFC][AMDGPU] Correct typo in DWARF Extensions For Heterogeneous Debugging

[t-tye]

Summary

A note in the defintion of DW_OP_piece had an incomplete sentence.

llvm/docs/AMDGPUDwarfExtensionsForHeterogeneousDebugging.rst

1.  ``DW_OP_piece``
     the part location description of a* ``DW_OP_piece`` *operation.*
 
     *The evaluation rules for the* ``DW_OP_piece`` *operation allow it to be
     compatible with the DWARF Version 5 definition.*
 
     .. note::
 
       Since these extensions allow location descriptions to be entries on the
-      stack, a simpler operation to create composite location descriptions. For
-      example, just one operation that specifies how many parts, and pops pairs
-      of stack entries for the part size and location description. Not only
-      would this be a simpler operation and avoid the complexities of incomplete
-      composite location descriptions, but it may also have a smaller encoding
-      in practice. However, the desire for compatibility with DWARF Version 5 is
-      likely a stronger consideration.
+      stack, a simpler operation to create composite location descriptions could
+      be defined. For example, just one operation that specifies how many parts,
+      and pops pairs of stack entries for the part size and location
+      description. Not only would this be a simpler operation and avoid the
+      complexities of incomplete composite location descriptions, but it may
+      also have a smaller encoding in practice. However, the desire for
+      compatibility with DWARF Version 5 is likely a stronger consideration.
 
 2.  ``DW_OP_bit_piece``
 
     ``DW_OP_bit_piece`` has two operands. The first is an unsigned LEB128
     integer that represents the part bit size S. The second is an unsigned
     LEB128 integer that represents a bit displacement B.
 
     The action is the same as for ``DW_OP_piece``, except that any part created