add: fix help spelling/grammar

Author: Stebalien

core/commands/add.go

@@ -123,7 +123,7 @@ You can now check what blocks have been created by:
 		cmdkit.BoolOption(fstoreCacheOptionName, "Check the filestore for pre-existing blocks. (experimental)"),
 		cmdkit.IntOption(cidVersionOptionName, "CID version. Defaults to 0 unless an option that depends on CIDv1 is passed. (experimental)"),
 		cmdkit.StringOption(hashOptionName, "Hash function to use. Implies CIDv1 if not sha2-256. (experimental)").WithDefault("sha2-256"),
-		cmdkit.BoolOption(inlineOptionName, "Inline small blcoks into CID. (experimental)"),
+		cmdkit.BoolOption(inlineOptionName, "Inline small blocks into CIDs. (experimental)"),
 		cmdkit.IntOption(inlineLimitOptionName, "Maximum block size to inline. (experimental)").WithDefault(64),
 	},
 	PreRun: func(req *cmds.Request, env cmds.Environment) error {