[aaelf64] Fix typos in TLS descriptor relocations' comments

The comments for the `R_<CLS>_TLSDESC_LD_PREL19` and
`R_<CLS>_TLSDESC_ADR_PREL21` TLS relocations incorrectly mentioned a
range check that stated `-220 <= X < 2^20` instead of the expected
`-2^20 <= x < 2^20`. This patch fixes it.

Author: pratlucas

aaelf64/aaelf64.rst

@@ -1455,9 +1455,9 @@ Thread-local storage descriptors
   +------------+------------+---------------------------------+----------------------------------+----------------------------------------------------------------------------------------------+
   | ELF64 Code | ELF32 Code | Name                            | Operation                        | Comment                                                                                      |
   +============+============+=================================+==================================+==============================================================================================+
-  | 560        | 122        | R\_<CLS>\_TLSDESC\_ LD\_PREL19  | G(GTLSDESC(S+A)) - P             | Set a load-literal immediate to bits [20:2]; check -220 <= X < 2\ :sup:`20`; check X & 3 = 0.|
+  | 560        | 122        | R\_<CLS>\_TLSDESC\_ LD\_PREL19  | G(GTLSDESC(S+A)) - P             | Set a load-literal immediate to bits [20:2]; check -2\ :sup:`20` <= X < 2\ :sup:`20`; check X & 3 = 0.|
   +------------+------------+---------------------------------+----------------------------------+----------------------------------------------------------------------------------------------+
-  | 561        | 123        | R\_<CLS>\_TLSDESC\_ ADR\_PREL21 | G(GTLSDESC(S+A) - P              | Set an ADR immediate field to bits [20:0]; check -220 <= X < 2\ :sup:`20`.                   |
+  | 561        | 123        | R\_<CLS>\_TLSDESC\_ ADR\_PREL21 | G(GTLSDESC(S+A) - P              | Set an ADR immediate field to bits [20:0]; check -2\ :sup:`20` <= X < 2\ :sup:`20`.                   |
   +------------+------------+---------------------------------+----------------------------------+----------------------------------------------------------------------------------------------+
   | 562        | 124        | R\_<CLS>\_TLSDESC\_ ADR\_PAGE21 | Page(G(GTLSDESC(S+A))) - Page(P) | Set an ADRP immediate field to bits [32:12] of X; check -2\ :sup:`32` <= X < 2\ :sup:`32`.   |
   +------------+------------+---------------------------------+----------------------------------+----------------------------------------------------------------------------------------------+