Fix spelling mistakes caught by debian lintian

src/btop_menu.cpp

@@ -194,10 +194,10 @@ namespace Menu {
 				"Max 9 presets.",
 				"",
 				"Format: \"box_name:P:G,box_name:P:G\"",
-				"P=(0 or 1) for alternate positons.",
+				"P=(0 or 1) for alternate positions.",
 				"G=graph symbol to use for box.",
 				"",
-				"Use withespace \" \" as seprator between",
+				"Use withespace \" \" as separator between",
 				"different presets.",
 				"",
 				"Example:",
@@ -206,7 +206,7 @@ namespace Menu {
 				"Manually set which boxes to show.",
 				"",
 				"Available values are \"cpu mem net proc\".",
-				"Seperate values with whitespace.",
+				"Separate values with whitespace.",
 				"",
 				"Toggle between presets with key \"p\"."},
 			{"update_ms",
@@ -435,7 +435,7 @@ namespace Menu {
 				"equals 100 percent in the io graphs.",
 				"(100 MiB/s by default).",
 				"",
-				"Format: \"device:speed\" seperate disks with",
+				"Format: \"device:speed\" separate disks with",
 				"whitespace \" \".",
 				"",
 				"Example: \"/dev/sda:100, /dev/sdb:20\"."},