doc: fix misspellings with 'codespell' tool

Signed-off-by: Anatol Pomozov <anatol.pomozov@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/Documentation/dynamic-debug-howto.txt b/Documentation/dynamic-debug-howto.txt
index 72322c6..1bbdcfc 100644
--- a/Documentation/dynamic-debug-howto.txt
+++ b/Documentation/dynamic-debug-howto.txt
@@ -279,7 +279,7 @@
 
 - modules do not need to define it explicitly
 - every module gets it tacitly, whether they use pr_debug or not
-- it doesnt appear in /sys/module/$module/parameters/
+- it doesn't appear in /sys/module/$module/parameters/
   To see it, grep the control file, or inspect /proc/cmdline.
 
 For CONFIG_DYNAMIC_DEBUG kernels, any settings given at boot-time (or