docs: dt: fix grammar and spelling

Signed-off-by: Markus Heidelberg <[e-mail]>
Signed-off-by: Rob Herring (Arm) <[e-mail]>

Documentation/devicetree/of_unittest.rst

···
 
 for the Device Tree Source Include files (.dtsi) included in testcases.dts.
 
-When the kernel is build with CONFIG_OF_UNITTEST enabled, then the following make
+When the kernel is built with CONFIG_OF_UNITTEST enabled, then the following make
 rule::
 
     $(obj)/%.dtb: $(src)/%.dts FORCE
···
     __dtb_testcases_end   - address marking the end of test data blob
 
 Secondly, it calls of_fdt_unflatten_tree() to unflatten the flattened
-blob. And finally, if the machine's device tree (i.e live tree) is present,
+blob. And finally, if the machine's device tree (i.e. live tree) is present,
 then it attaches the unflattened test data tree to the live tree, else it
 attaches itself as a live device tree.
 

Documentation/devicetree/overlay-notes.rst

···
 A Devicetree's overlay purpose is to modify the kernel's live tree, and
 have the modification affecting the state of the kernel in a way that
 is reflecting the changes.
-Since the kernel mainly deals with devices, any new device node that result
+Since the kernel mainly deals with devices, any new device node that results
 in an active device should have it created while if the device node is either
 disabled or removed all together, the affected device should be deregistered.
 
-Lets take an example where we have a foo board with the following base tree::
+Let's take an example where we have a foo board with the following base tree::
 
     ---- foo.dts ---------------------------------------------------------------
 	/* FOO platform */
···
 1) Call of_overlay_fdt_apply() to create and apply an overlay changeset. The
    return value is an error or a cookie identifying this overlay.
 
-2) Call of_overlay_remove() to remove and cleanup the overlay changeset
+2) Call of_overlay_remove() to remove and clean up the overlay changeset
    previously created via the call to of_overlay_fdt_apply(). Removal of an
    overlay changeset that is stacked by another will not be permitted.
 

Documentation/devicetree/usage-model.rst

···
 communication method for passing data from Open Firmware to a client
 program (like to an operating system).  An operating system used the
 Device Tree to discover the topology of the hardware at runtime, and
-thereby support a majority of available hardware without hard coded
+thereby supported a majority of available hardware without hard coded
 information (assuming drivers were available for all devices).
 
 Since Open Firmware is commonly used on PowerPC and SPARC platforms,
···
 	compatible = "ti,omap3-beagleboard-xm", "ti,omap3450", "ti,omap3";
 
 Where "ti,omap3-beagleboard-xm" specifies the exact model, it also
-claims that it compatible with the OMAP 3450 SoC, and the omap3 family
+claims that it is compatible with the OMAP 3450 SoC, and the omap3 family
 of SoCs in general.  You'll notice that the list is sorted from most
 specific (exact board) to least specific (SoC family).
 
···
 
 During early boot, the architecture setup code calls of_scan_flat_dt()
 several times with different helper callbacks to parse device tree
-data before paging is setup.  The of_scan_flat_dt() code scans through
+data before paging is set up.  The of_scan_flat_dt() code scans through
 the device tree and uses the helpers to extract information required
 during early boot.  Typically the early_init_dt_scan_chosen() helper
 is used to parse the chosen node including kernel parameters,