[cross-project-tests] Fixed a number of typos

[GabrielRavier]

Summary

I went over the output of the following mess of a command:

(ulimit -m 2000000; ulimit -v 2000000; git ls-files -z | parallel --xargs -0 cat | aspell list --mode=none --ignore-case | grep -E '^[A-Za-z][a-z]*$' | sort | uniq -c | sort -n | grep -vE '.{25}' | aspell pipe -W3 | grep : | cut -d' ' -f2 | less)

and proceeded to spend a few days looking at it to find probable typos
and fixed a few hundred of them in all of the llvm project (note, the
ones I found are not anywhere near all of them, but it seems like a
good start).

cross-project-tests/debuginfo-tests/dexter/dex/command/commands/DexDeclareAddress.py

 # DExTer : Debugging Experience Tester
 # ~~~~~~   ~         ~~         ~   ~~
 #
 # Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 # See https://llvm.org/LICENSE.txt for license information.
 # SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-"""Commmand sets the path for all following commands to 'declared_file'.
+"""Command sets the path for all following commands to 'declared_file'.
 """
 
 import os
 from pathlib import PurePath
 
 from dex.command.CommandBase import CommandBase, StepExpectInfo
 
 class DexDeclareAddress(CommandBase):

cross-project-tests/debuginfo-tests/dexter/dex/command/commands/DexDeclareFile.py

 # DExTer : Debugging Experience Tester
 # ~~~~~~   ~         ~~         ~   ~~
 #
 # Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 # See https://llvm.org/LICENSE.txt for license information.
 # SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-"""Commmand sets the path for all following commands to 'declared_file'.
+"""Command sets the path for all following commands to 'declared_file'.
 """
 
 from pathlib import PurePath
 
 from dex.command.CommandBase import CommandBase
 
 
 class DexDeclareFile(CommandBase):