package/pcm-tools: fix 'generating' typo

Found by codespell.

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
Signed-off-by: Julien Olivain <ju.o@free.fr>

package/pcm-tools/pcm-tools.mk

@@ -5,7 +5,7 @@
 ################################################################################
 
 # Don't use the github helper, as pcm-tools uses git attributes that are
-# replaced when gnerating the archive.
+# replaced when generating the archive.
 # 93fc9193a70e2f1f054be554c48f4a4791be5032 is the hash of the 202110 tag.
 PCM_TOOLS_VERSION = 93fc9193a70e2f1f054be554c48f4a4791be5032
 PCM_TOOLS_SITE = https://github.com/opcm/pcm