kfuncs: Update HID BPF helper function documentation

Apparently the pages for the HID BPF helper functions were not updated
after the sleepable flag was added to the kfuncs data file. So it got
updated when running the `make generate-docs` command for the last
commit.

Signed-off-by: Dylan Reimerink <[email protected]>

docs/linux/kfuncs/hid_bpf_allocate_context.md

@@ -32,6 +32,9 @@ A pointer to &struct hid_bpf_ctx on success, `NULL` on error.
 !!! note
 	The pointer returned by the kfunc may be NULL. Hence, it forces the user to do a NULL check on the pointer returned 
 	from the kfunc before making use of it (dereferencing or passing to another helper).
+
+!!! note
+    This function may sleep, and therefore can only be used from [sleepable programs](../syscall/BPF_PROG_LOAD.md/#bpf_f_sleepable).
 <!-- [/KFUNC_DEF] -->
 
 ## Usage

docs/linux/kfuncs/hid_bpf_hw_output_report.md

@@ -26,6 +26,9 @@ Returns the number of bytes transferred on success, a negative error code otherw
 
 <!-- [KFUNC_DEF] -->
 `#!c int hid_bpf_hw_output_report(struct hid_bpf_ctx *ctx, __u8 *buf, size_t buf__sz)`
+
+!!! note
+    This function may sleep, and therefore can only be used from [sleepable programs](../syscall/BPF_PROG_LOAD.md/#bpf_f_sleepable).
 <!-- [/KFUNC_DEF] -->
 
 ## Usage

docs/linux/kfuncs/hid_bpf_hw_request.md

@@ -30,6 +30,9 @@ Communicate with a HID device
 
 <!-- [KFUNC_DEF] -->
 `#!c int hid_bpf_hw_request(struct hid_bpf_ctx *ctx, __u8 *buf, size_t buf__sz, hid_report_type rtype, hid_class_request reqtype)`
+
+!!! note
+    This function may sleep, and therefore can only be used from [sleepable programs](../syscall/BPF_PROG_LOAD.md/#bpf_f_sleepable).
 <!-- [/KFUNC_DEF] -->
 
 ## Usage

docs/linux/kfuncs/hid_bpf_input_report.md

@@ -29,6 +29,9 @@ Returns `0` on success, a negative error code otherwise. This function will wait
 
 <!-- [KFUNC_DEF] -->
 `#!c int hid_bpf_input_report(struct hid_bpf_ctx *ctx, hid_report_type type, u8 *buf, const size_t buf__sz)`
+
+!!! note
+    This function may sleep, and therefore can only be used from [sleepable programs](../syscall/BPF_PROG_LOAD.md/#bpf_f_sleepable).
 <!-- [/KFUNC_DEF] -->
 
 ## Usage

docs/linux/kfuncs/hid_bpf_release_context.md

@@ -20,6 +20,9 @@ Release the previously allocated context @ctx
 !!! note
 	This kfunc releases the pointer passed in to it. There can be only one referenced pointer that can be passed in. 
 	All copies of the pointer being released are invalidated as a result of invoking this kfunc.
+
+!!! note
+    This function may sleep, and therefore can only be used from [sleepable programs](../syscall/BPF_PROG_LOAD.md/#bpf_f_sleepable).
 <!-- [/KFUNC_DEF] -->
 
 ## Usage