Update docs to use relative code links.

Use relative links to locations within the same repository. This means
that in the Github UI the reader will follow the link to the location
in the same branch rather than to a fixed, predetermined branch.

Signed-off-by: James Peach <jpeach@cloudflare.com>

docs/dependencies.md

@@ -10,19 +10,18 @@ Both these dependencies are listed here:
 
 ## Internal dependencies
 
-- [nostd::variant](https://github.com/open-telemetry/opentelemetry-cpp/blob/v1.0.0-rc1/api/include/opentelemetry/nostd/absl/types/variant.h):
+- [nostd::variant](../api/include/opentelemetry/nostd/absl/types/variant.h):
   This is backported from [Abseil C++
   libraries](https://github.com/abseil/abseil-cpp) and used as default variant
   implementation. License: `Apache License 2.0`
-- [TraceLoggingDynamic](https://github.com/open-telemetry/opentelemetry-cpp/blob/v1.0.0-rc1/exporters/etw/include/opentelemetry/exporters/etw/TraceLoggingDynamic.h):
-  Dynamic TraceLogging Provider API for C++ used by ETW exporter. License: `MIT
-  License`
+- [TraceLoggingDynamic](../exporters/etw/include/opentelemetry/exporters/etw/TraceLoggingDynamic.h):
+  Dynamic TraceLogging Provider API for C++ used by ETW exporter. License: `MIT License`
 
 ## External dependencies
 
-- [API](https://github.com/open-telemetry/opentelemetry-cpp/tree/v1.0.0-rc1/api)
+- [API](../api)
   &
-  [SDK](https://github.com/open-telemetry/opentelemetry-cpp/tree/v1.0.0-rc1/sdk):
+  [SDK](../sdk):
   - Uses Standard C++ library for latest features (std::string_view,
     std::variant, std::span, std::shared_ptr, std::unique_ptr) with  C++14/17/20
     compiler if `WITH_STL` cmake option is enabled or `HAVE_CPP_STDLIB` macro is
@@ -36,7 +35,7 @@ Both these dependencies are listed here:
     `--//api:with_abseil=true`) bazel option is enabled. License: `Apache
     License 2.0`
 
-- [OTLP/HTTP+JSON](https://github.com/open-telemetry/opentelemetry-cpp/tree/v1.0.0-rc1/exporters/otlp)
+- [OTLP/HTTP+JSON](../exporters/otlp)
   exporter:
   - [protobuf](https://github.com/protocolbuffers/protobuf):  Library to
     serialize structured data.
@@ -60,19 +59,19 @@ Both these dependencies are listed here:
       library.
     - License: `MIT License`
 
-- [OTLP/gRPC](https://github.com/open-telemetry/opentelemetry-cpp/tree/v1.0.0-rc1/exporters/otlp)
+- [OTLP/gRPC](../exporters/otlp)
   exporter:
   - `protobuf`  OTLP messages are constructed as protobuf payloads.
   - [gRPC](https://github.com/grpc/grpc): An RPC library and framework
     - Exporter communicates with OTLP collector using gRPC transport mechanism.
     - License: `Apache License 2.0`
 
-- [Zipkin](https://github.com/open-telemetry/opentelemetry-cpp/tree/v1.0.0-rc1/exporters/zipkin)
+- [Zipkin](../exporters/zipkin)
   exporter:
   - `libcurl` for connecting with Zipkin server over HTTP protocol.
   - `nlohmann/json` for encoding Zipkin messages.
 
-- [Jaeger](https://github.com/open-telemetry/opentelemetry-cpp/tree/v1.0.0-rc1/exporters/jaeger)
+- [Jaeger](../exporters/jaeger)
   exporter:
   - [Thrift](https://github.com/apache/thrift) - Serialization and RPC
     framework.
@@ -81,21 +80,21 @@ Both these dependencies are listed here:
       sent to remote Jaeger service.
     - License: `Apache License 2.0`
 
-- [ETW](https://github.com/open-telemetry/opentelemetry-cpp/tree/v1.0.0-rc1/exporters/etw)
+- [ETW](../exporters/etw)
   exporter:
   - `nlohmann/json` for generating MessagePack serialization for message to be
     transmitted to ETW.
 
-- [Prometheus](https://github.com/open-telemetry/opentelemetry-cpp/tree/v1.0.0-rc1/exporters/prometheus)
+- [Prometheus](../exporters/prometheus)
   exporter:
   - [`prometheus-cpp`](https://github.com/jupp0r/prometheus-cpp) Prometheus
     Client Library for Modern C++
     - License: `MIT License`
 
-- [ElasticSearch](https://github.com/open-telemetry/opentelemetry-cpp/tree/v1.0.0-rc1/exporters/elasticsearch)
+- [ElasticSearch](../exporters/elasticsearch)
   exporter:
   - `libcurl` for connecting with Elasticsearch server over HTTP protocol.
   - `nlohmann/json` for encoding Elastic Search messages.
 
-- [Zpages](https://github.com/open-telemetry/opentelemetry-cpp/tree/v1.0.0-rc1/ext/src/zpages):
+- [Zpages](../ext/src/zpages):
   - None

docs/google-test.md

@@ -109,7 +109,7 @@ and dependencies. Along with a `BUILD` file, a `WORKSPACE` file exists that
 identifies the directory it resides in as a bazel workspace. In the OTel C++
 repository, the SDK unit tests using the Google Test framework to ensure code
 functionality. In the
-[BUILD](https://github.com/open-telemetry/opentelemetry-cpp/tree/master/sdk/test/trace)
+[BUILD](../sdk/test/trace)
 file for trace tests, there are six different targets, each corresponding to a
 different unit test. An example target taken from this file is shown below.