Fix typo, arvm7 -> armv7

(cherry picked from commit 3a62d4f)

Author: brad0

lldb/docs/man/lldb.rst

@@ -256,11 +256,11 @@ executable. To disambiguate between arguments passed to lldb and arguments
 passed to the debugged executable, arguments starting with a - must be passed
 after --.
 
-  lldb --arch x86_64 /path/to/program program argument -- --arch arvm7
+  lldb --arch x86_64 /path/to/program program argument -- --arch armv7
 
 For convenience, passing the executable after -- is also supported.
 
-  lldb --arch x86_64 -- /path/to/program program argument --arch arvm7
+  lldb --arch x86_64 -- /path/to/program program argument --arch armv7
 
 Passing one of the attach options causes :program:`lldb` to immediately attach
 to the given process.

lldb/tools/driver/Driver.cpp

@@ -751,11 +751,11 @@ static void printHelp(LLDBOptTable &table, llvm::StringRef tool_name) {
   arguments passed to the debugged executable, arguments starting with a - must
   be passed after --.
 
-    lldb --arch x86_64 /path/to/program program argument -- --arch arvm7
+    lldb --arch x86_64 /path/to/program program argument -- --arch armv7
 
   For convenience, passing the executable after -- is also supported.
 
-    lldb --arch x86_64 -- /path/to/program program argument --arch arvm7
+    lldb --arch x86_64 -- /path/to/program program argument --arch armv7
 
   Passing one of the attach options causes lldb to immediately attach to the
   given process.