Docs with an updated install instruction (#343)

Summary:
This PR updates the installation instruction. It missed few crucial information and thus the projects installing flipper as a dependency were facing issues. It addresses the issue #341. It also brings the sample application at par with the documentation.
Pull Request resolved: https://github.com/facebook/flipper/pull/343

Reviewed By: danielbuechele

Differential Revision: D13507298

Pulled By: priteshrnandgaonkar

fbshipit-source-id: 5a4b23d79930cb7eeb491e359b616d3558e260fb

iOS/SampleSwift/SampleSwift.xcodeproj/project.pbxproj

@@ -353,10 +353,7 @@
 					"$(inherited)",
 					"@executable_path/Frameworks",
 				);
-				OTHER_CPLUSPLUSFLAGS = (
-					"$(OTHER_CFLAGS)",
-					"-DFB_SONARKIT_ENABLED=1",
-				);
+				OTHER_CPLUSPLUSFLAGS = "$(OTHER_CFLAGS)";
 				OTHER_LDFLAGS = (
 					"$(inherited)",
 					"-ObjC",
@@ -379,7 +376,6 @@
 					"\"CFNetwork\"",
 					"-framework",
 					"\"Security\"",
-					"-DFB_SONARKIT_ENABLED=1",
 				);
 				OTHER_SWIFT_FLAGS = "$(inherited) -Xcc -fmodule-map-file=\"${PODS_ROOT}/Headers/Public/FlipperKit/FlipperKit.modulemap\" -Xcc -DFB_SONARKIT_ENABLED";
 				PRODUCT_BUNDLE_IDENTIFIER = com.facebook.flipper.SampleSwift;
@@ -417,10 +413,7 @@
 					"$(inherited)",
 					"@executable_path/Frameworks",
 				);
-				OTHER_CPLUSPLUSFLAGS = (
-					"$(OTHER_CFLAGS)",
-					"-DFB_SONARKIT_ENABLED=1",
-				);
+				OTHER_CPLUSPLUSFLAGS = "$(OTHER_CFLAGS)";
 				OTHER_LDFLAGS = (
 					"$(inherited)",
 					"-ObjC",
@@ -443,7 +436,6 @@
 					"\"CFNetwork\"",
 					"-framework",
 					"\"Security\"",
-					"-DFB_SONARKIT_ENABLED=1",
 				);
 				OTHER_SWIFT_FLAGS = "$(inherited) -Xcc -fmodule-map-file=\"${PODS_ROOT}/Headers/Public/FlipperKit/FlipperKit.modulemap\" -Xcc -DFB_SONARKIT_ENABLED";
 				PRODUCT_BUNDLE_IDENTIFIER = com.facebook.flipper.SampleSwift;