dma-buf: Improve CONFIG_DMABUF_MOVE_NOTIFY help text

Improve the help text for the CONFIG_DMABUF_MOVE_NOTIFY symbol by:
  1. Removing duplicated single quotes,
  2. Adding a missing subject,
  3. Fixing a misspelling of "yet",
  4. Wrapping long lines.

Fixes: bb42df46 ("dma-buf: add dynamic DMA-buf handling v15")
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200324125442.21983-1-geert+renesas@glider.be

drivers/dma-buf/Kconfig

@@ -43,11 +43,12 @@ config DMABUF_MOVE_NOTIFY
 	bool "Move notify between drivers (EXPERIMENTAL)"
 	default n
 	help
-	  Don''t pin buffers if the dynamic DMA-buf interface is available on both the
-	  exporter as well as the importer. This fixes a security problem where
-	  userspace is able to pin unrestricted amounts of memory through DMA-buf.
-	  But marked experimental because we don''t jet have a consistent execution
-	  context and memory management between drivers.
+	  Don't pin buffers if the dynamic DMA-buf interface is available on
+	  both the exporter as well as the importer. This fixes a security
+	  problem where userspace is able to pin unrestricted amounts of memory
+	  through DMA-buf.
+	  This is marked experimental because we don't yet have a consistent
+	  execution context and memory management between drivers.
 
 config DMABUF_SELFTESTS
 	tristate "Selftests for the dma-buf interfaces"