Update protobuf github url (#1717)

Author: xuwei-k

docs/src/main/markdown/customizations.md

@@ -295,7 +295,7 @@ In proto 3, unlike proto 2, primitives are not wrapped in an option by default.
 The standard technique to obtain an optional primitive is to wrap it inside a
 message (since messages are provided inside an `Option`). Google provides
 standard wrappers to the primitive types in
-[wrappers.proto](https://github.com/google/protobuf/blob/master/src/google/protobuf/wrappers.proto).
+[wrappers.proto](https://github.com/protocolbuffers/protobuf/blob/master/src/google/protobuf/wrappers.proto).
 
 `primitive_wrappers` is enabled by default for ScalaPB>=0.6.0. Whenever one
 of the standard wrappers is used, it will be mapped to `Option[X]` where `X`

e2e/src/main/protobuf/issue286_flat.proto

@@ -1,7 +1,7 @@
 syntax = "proto2";
 
 // We can't have the flat_package file in the main e2e protobuf directory
-// due to https://github.com/google/protobuf/issues/3114
+// due to https://github.com/protocolbuffers/protobuf/issues/3114
 import "scalapb/scalapb.proto";
 
 option (scalapb.options).flat_package = true;

e2e/src/main/protobuf/issue286_flat2.proto

@@ -1,7 +1,7 @@
 syntax = "proto2";
 
 // We can't have the flat_package file in the main e2e protobuf directory
-// due to https://github.com/google/protobuf/issues/3114
+// due to https://github.com/protocolbuffers/protobuf/issues/3114
 import "scalapb/scalapb.proto";
 
 option (scalapb.options).flat_package = true;

protobuf/scalapb/scalapb.proto

@@ -35,7 +35,7 @@ message ScalaPbOptions {
   optional bool single_file = 5;
 
   // By default, wrappers defined at
-  // https://github.com/google/protobuf/blob/master/src/google/protobuf/wrappers.proto,
+  // https://github.com/protocolbuffers/protobuf/blob/master/src/google/protobuf/wrappers.proto,
   // are mapped to an Option[T] where T is a primitive type. When this field
   // is set to true, we do not perform this transformation.
   optional bool no_primitive_wrappers = 7;

scalapb-runtime/src/main/scala/scalapb/descriptors/Descriptor.scala

@@ -213,7 +213,7 @@ class EnumDescriptor private[descriptors] (
   def findValueByNumber(number: Int): Option[EnumValueDescriptor] = values.find(_.number == number)
 
   // We port the trick described here to Scala:
-  // https://github.com/google/protobuf/blob/d36c0c538a545fac5d9db6ba65c525246d4efa95/java/core/src/main/java/com/google/protobuf/Descriptors.java#L1600
+  // https://github.com/protocolbuffers/protobuf/blob/d36c0c538a545fac5d9db6ba65c525246d4efa95/java/core/src/main/java/com/google/protobuf/Descriptors.java#L1600
   // With one difference that we use an Option[Int] as key instead of java.lang.Integer.  We need to have the key
   // reachable from the EnumValueDescriptor, so we take advantage of enumValueDescriptor.proto.number which happens
   // to be Option[Int].

scalapb-runtime/src/main/scala/scalapb/options/ScalaPbOptions.scala

@@ -21,7 +21,7 @@ package scalapb.options
   *   to a single Scala file.
   * @param noPrimitiveWrappers
   *   By default, wrappers defined at
-  *   https://github.com/google/protobuf/blob/master/src/google/protobuf/wrappers.proto,
+  *   https://github.com/protocolbuffers/protobuf/blob/master/src/google/protobuf/wrappers.proto,
   *   are mapped to an Option[T] where T is a primitive type. When this field
   *   is set to true, we do not perform this transformation.
   * @param primitiveWrappers

scalapb-runtime/src/test/scalajvm/scalapb/FieldMaskUtilPropSpec.scala

@@ -7,8 +7,8 @@ import org.scalacheck.Prop._
 
 class FieldMaskUtilPropSpec extends ScalaCheckSuite {
   // protobuf-java use guava
-  // https://github.com/google/protobuf/blob/v3.6.0/java/util/src/main/java/com/google/protobuf/util/FieldMaskUtil.java#L175
-  // https://github.com/google/protobuf/blob/v3.6.0/java/util/src/main/java/com/google/protobuf/util/FieldMaskUtil.java#L159
+  // https://github.com/protocolbuffers/protobuf/blob/v3.6.0/java/util/src/main/java/com/google/protobuf/util/FieldMaskUtil.java#L175
+  // https://github.com/protocolbuffers/protobuf/blob/v3.6.0/java/util/src/main/java/com/google/protobuf/util/FieldMaskUtil.java#L159
 
   // protobuf-java convert only ASCII characters
   // e.g. `'\u00E0'.toUpper == '\u00C0'` but protobuf-java does not convert these characters