perf config: Show default report configuration in example and docs

Signed-off-by: Milian Wolff <[e-mail]>
LPU-Reference: [e-mail]
Signed-off-by: Arnaldo Carvalho de Melo <[e-mail]>

tools/perf/Documentation/perf-config.txt

···
 		order = caller
 		sort-key = function
 
+	[report]
+		# Defaults
+		sort-order = comm,dso,symbol
+		percent-limit = 0
+		queue-size = 0
+		children = true
+		group = true
+
 Variables
 ~~~~~~~~~
 

tools/perf/Documentation/perfconfig.example

···
 	use_offset = true
 	jump_arrows = true
 	show_nr_jumps = false
+
+[report]
+
+	# Defaults
+	sort-order = comm,dso,symbol
+	percent-limit = 0
+	queue-size = 0
+	children = true
+	group = true