Explain N in interrupt wire array

Signed-off-by: Sunil V L <[email protected]>

src/rimt-main.adoc

@@ -128,7 +128,8 @@ a|
                                                                This field is valid only if "Number
                                                                of interrupt wires" is not 0.
 4+|List of interrupt wires.
-| Interrupt wire Array        | 8 * N        | 40            | Array of Interrupt Wire Structures.
+| Interrupt wire array        | 8 * N        | 40            | Array of Interrupt Wire Structures where N
+							       is the number of elements in the array.
                                                                See <<interrupt_wire_structure>>.
 |===
 
@@ -158,7 +159,7 @@ a|
 |===
 
 ==== PCIe Root Complex Node
-The PCIe root complex node the logical PCIe root complex which can be used to
+The PCIe root complex node is the logical PCIe root complex which can be used to
 represent an entire physical root complex, an RCiEP/set of RCiEPs, a standalone PCIe device or the
 hierarchy below a PCIe host bridge.