Minor presentation improvements

Minor wording improvement and cosmetic formatting improvements.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
diff --git a/SECURITY.md b/SECURITY.md
index baf4468..bd18f6c 100644
--- a/SECURITY.md
+++ b/SECURITY.md
@@ -6,7 +6,8 @@
 
 ## Security Incident Handling Process
 
-Our security process is detailled in our [security
+Our security process is detailled in our
+[security
 center](https://developer.trustedfirmware.org/w/mbed-tls/security-center/).
 
 Its primary goal is to ensure fixes are ready to be deployed when the issue
@@ -14,5 +15,6 @@
 
 ## Maintained branches
 
-Only the maintained branches, as listed in BRANCHES.md, get security fixes.
+Only the maintained branches, as listed in [`BRANCHES.md`](BRANCHES.md),
+get security fixes.
 Users are urged to always use the latest version of a maintained branch.