Address some review comments

man/rgblink.5

@@ -69,7 +69,7 @@ The possible types are:
 .Ic ROM0 , ROMX , VRAM , SRAM , WRAM0 , WRAMX , OAM ,
 and
 .Ic HRAM .
-However, if the type only contains a single bank, then the number can be omitted.
+If the type only contains a single bank, then the number can be omitted.
 The applicable types are:
 .Ic ROM0 ,
 .Ic ROMX No if Fl t No is passed to Xr rgblink 1 ,
@@ -96,7 +96,9 @@ sets the
 .Dq current address
 to
 .Ar addr .
-The new address cannot be less than the old one.
+THis directive cannot be used to move the address backwards:
+.Ar addr
+must be greater than or equal to the current address.
 .Pp
 .Ql Ic FLOATING
 causes all sections between it and the next
@@ -116,17 +118,18 @@ If
 is omitted, it is implied to be 0.
 For example, if the
 .Dq current address
-is $007,
+is $0007,
 .Ql ALIGN 8
-would set it to $100, and
+would set it to $0100, and
 .Ql ALIGN 8 , 10
-would set it to $00A.
+would set it to $000A.
 .Pp
 .Ql Ic DS Ar size
 increases the
 .Dq current address
 by
 .Ar size .
+The gap is not allocated, thus smaller floating sections can later be placed there.
 .El
 .Ss Section placement
 A section can be placed simply by naming it (with a string).

src/link/script.y

@@ -470,7 +470,7 @@ static void alignTo(uint32_t alignment, uint32_t alignOfs) {
 static void pad(uint32_t length) {
 	auto const &context = lexerStack.back();
 	if (activeType == SECTTYPE_INVALID) {
-		scriptError(context, "Cannot pad: no memory region is active");
+		scriptError(context, "Cannot increase the current address: no memory region is active");
 		return;
 	}
 
@@ -484,7 +484,7 @@ static void pad(uint32_t length) {
 
 	assert(pc >= typeInfo.startAddr);
 	if (uint16_t offset = pc - typeInfo.startAddr; length + offset > typeInfo.size) {
-		scriptError(context, "Cannot pad by %u bytes: only %u bytes to $%04" PRIx16,
+		scriptError(context, "Cannot increase the current address by %u bytes: only %u bytes to $%04" PRIx16,
 		            length, typeInfo.size - offset, (uint16_t)(endaddr(activeType) + 1));
 	} else {
 		pc += length;