global: Remove leading/trailing blank lines in files

Remove leading/trailing blank lines in .c, .h, .py, .rst, .yml, and
.yaml files.

Will avoid failures with the new CI test in
https://github.com/zephyrproject-rtos/ci-tools/pull/112, though it only
checks changed files.

Move the 'target-notes' target in boards/xtensa/odroid_go/doc/index.rst
to get rid of the trailing blank line there. It was probably misplaced.

Signed-off-by: Ulf Magnusson <Ulf.Magnusson@nordicsemi.no>

doc/reference/usermode/mpu_stack_objects.rst

@@ -62,4 +62,3 @@ logically OR regions to determine enforcement policy.
 Size and alignment constraints may result in stack allocations being larger
 than the requested size.  Region priority mechanisms may result in
 some added complexity when implementing stack guards.
-

doc/reference/usermode/mpu_userspace.rst

@@ -23,4 +23,3 @@ passed-in parameters are all validated.  The user mode thread is then elevated
 to privileged mode, the stack is switched to use the privileged stack, and the
 call is made to the specified kernel API.  On return from the kernel API,  the
 thread is set back to user mode and the stack is restored to the user stack.
-

doc/reference/usermode/syscalls.rst

@@ -355,4 +355,3 @@ Functions for invoking system calls are defined in
 * :c:func:`_arch_syscall_invoke4`
 * :c:func:`_arch_syscall_invoke5`
 * :c:func:`_arch_syscall_invoke6`
-