doc: change "Modules" page name to "Driver Modules"

This eliminates conflict with Doxygen auto-generated
"Modules" page.

Signed-off-by: Jim Harris <james.r.harris@intel.com>
Change-Id: I571839240405ec0dc952b6a4f7ed65baab4cc42c

Reviewed-on: https://review.gerrithub.io/423165
Chandler-Test-Pool: SPDK Automated Test System <sys_sgsw@intel.com>
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>

doc/Doxyfile

@@ -789,7 +789,7 @@ INPUT                  = ../include/spdk \
                          prog_guides.md \
                          general.md \
                          misc.md \
-                         modules.md \
+                         driver_modules.md \
                          tools.md \
                          experimental_tools.md \
                          performance_reports.md \

doc/driver_modules.md

@@ -1,4 +1,4 @@
-# Modules {#modules}
+# Driver Modules {#driver_modules}
 
 - @subpage nvme
 - @subpage ioat

doc/index.md

@@ -18,8 +18,8 @@
 # Miscellaneous
 @copydoc misc
 
-# Modules
-@copydoc modules
+# Driver Modules
+@copydoc driver_modules
 
 # Tools
 @copydoc tools