So, i also noticed that some of the parameters represented
as boolean have no value constrain checks and accept integer
values due to u8 implementation, so i wrote a note for every
boolean parameter that have no constrain checks in code. and
fixed a typo in fmwark instead of fwmark.

Added notes for 19 confirmed parameters,
Verified by code inspection and runtime testing.

Signed-off-by: Abdelrahman Fekry <redacted>
---
 Documentation/networking/ip-sysctl.rst | 50 +++++++++++++++++++++++---
 1 file changed, 45 insertions(+), 5 deletions(-)

diff --git a/Documentation/networking/ip-sysctl.rst b/Documentation/networking/ip-sysctl.rst
index f7ff8c53f412..99e786915204 100644
--- a/Documentation/networking/ip-sysctl.rst
+++ b/Documentation/networking/ip-sysctl.rst

@@ -68,6 +68,8 @@ ip_forward_use_pmtu - BOOLEAN
 
 	- 0 - disabled
 	- 1 - enabled
+
+	note: Accepts integer values (0-255) but only 0/1 have defined behaviour.