doc: kernel: use zephyr_file role

Link to files in git tree on Github.

Signed-off-by: Anas Nashif <[email protected]>

Author: nashif

doc/kernel/other/ring_buffers.rst

@@ -306,7 +306,7 @@ operations on the ring buffer's memory.  For example:
 API Reference
 *************
 
-The following ring buffer APIs are provided by :file:`include/ring_buffer.h`:
+The following ring buffer APIs are provided by :zephyr_file:`include/ring_buffer.h`:
 
 .. doxygengroup:: ring_buffer_apis
    :project: Zephyr

doc/kernel/usermode/memory_domain.rst

@@ -179,7 +179,7 @@ Related configuration options:
 APIs
 ****
 
-The following memory domain APIs are provided by :file:`kernel.h`:
+The following memory domain APIs are provided by :zephyr_file:`include/kernel.h`:
 
 * :c:macro:`K_MEM_PARTITION_DEFINE`
 * :cpp:func:`k_mem_domain_init()`

doc/kernel/usermode/syscalls.rst

@@ -477,7 +477,7 @@ APIs
 ****
 
 Helper macros for creating system call handlers are provided in
-:file:`kernel/include/syscall_handler.h`:
+:zephyr_file:`kernel/include/syscall_handler.h`:
 
 * :c:macro:`Z_SYSCALL_HANDLER()`
 * :c:macro:`Z_SYSCALL_HANDLER1_SIMPLE()`
@@ -496,7 +496,7 @@ Helper macros for creating system call handlers are provided in
 * :c:macro:`Z_SYSCALL_VERIFY`
 
 Functions for invoking system calls are defined in
-:file:`include/syscall.h`:
+:zephyr_file:`include/syscall.h`:
 
 * :c:func:`_arch_syscall_invoke0`
 * :c:func:`_arch_syscall_invoke1`