git: add comments for ignored files

Split the ignored file list into section based on logical groups of files,
putting a comment at the top of each section clarifying what it is.

Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>

diff --git a/.gitignore b/.gitignore
index 9105e26..b23e1db 100644 (file)
--- a/.gitignore
+++ b/.gitignore
@@ -1,9 +1,12 @@
+# ignore generated documentation tables
 doc/guides/nics/overview_table.txt
 doc/guides/cryptodevs/overview_feature_table.txt
 doc/guides/cryptodevs/overview_cipher_table.txt
 doc/guides/cryptodevs/overview_auth_table.txt
 doc/guides/cryptodevs/overview_aead_table.txt
 doc/guides/compressdevs/overview_feature_table.txt
+
+# ignore generated ctags/cscope files
 cscope.out.po
 cscope.out.in
 cscope.out