Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/net/dccp/output.c b/net/dccp/output.c
index 784d3021..136d41c 100644
--- a/net/dccp/output.c
+++ b/net/dccp/output.c
@@ -143,7 +143,7 @@
 }
 
 /**
- * dccp_determine_ccmps  -  Find out about CCID-specfic packet-size limits
+ * dccp_determine_ccmps  -  Find out about CCID-specific packet-size limits
  * We only consider the HC-sender CCID for setting the CCMPS (RFC 4340, 14.),
  * since the RX CCID is restricted to feedback packets (Acks), which are small
  * in comparison with the data traffic. A value of 0 means "no current CCMPS".