docs: vendor-ibm-astlpc: Tweak description of header magic

Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
Change-Id: Ied2a9d85c63d44bb227385f3ab981b44e8498d80
diff --git a/docs/bindings/vendor-ibm-astlpc.md b/docs/bindings/vendor-ibm-astlpc.md
index e7df566..2cf85c5 100644
--- a/docs/bindings/vendor-ibm-astlpc.md
+++ b/docs/bindings/vendor-ibm-astlpc.md
@@ -189,8 +189,8 @@
 } __attribute__((packed));
 ```
 
-Where the magic value marking the beginning of the control area is the ASCII
-encoding of "MCTP":
+The magic value marking the beginning of the control area is the ASCII encoding
+of "MCTP":
 
 ```c
 #define LPC_MAGIC 0x4d435450