fix: use shorthand syntax in examples

Author: SGSSGene

README.md

@@ -403,12 +403,8 @@ CPMAddPackage("gh:jbeder/yaml-cpp#[email protected]")
 ### [nlohmann/json](https://github.com/nlohmann/json)
 
 ```cmake
-CPMAddPackage(
-  NAME nlohmann_json
-  VERSION 3.9.1
-  GITHUB_REPOSITORY nlohmann/json
-  OPTIONS
-    "JSON_BuildTests OFF"
+CPMAddPackage("gh:nlohmann/[email protected]"
+  OPTIONS "JSON_BuildTests OFF"
 )
 ```
 
@@ -437,20 +433,15 @@ For a working example of using CPM to download and configure the Boost C++ Libra
 
 ```cmake
 # the install option has to be explicitly set to allow installation
-CPMAddPackage(
-  GITHUB_REPOSITORY jarro2783/cxxopts
-  VERSION 2.2.1
-  OPTIONS "CXXOPTS_BUILD_EXAMPLES NO" "CXXOPTS_BUILD_TESTS NO" "CXXOPTS_ENABLE_INSTALL YES"
+CPMAddPackage("gh:jarro2783/[email protected]"
+    OPTIONS "CXXOPTS_BUILD_EXAMPLES NO" "CXXOPTS_BUILD_TESTS NO" "CXXOPTS_ENABLE_INSTALL YES"
 )
 ```
 
 ### [google/benchmark](https://github.com/google/benchmark)
 
 ```cmake
-CPMAddPackage(
-  NAME benchmark
-  GITHUB_REPOSITORY google/benchmark
-  VERSION 1.5.2
+CPMAddPackage("gh:google/[email protected]"
   OPTIONS "BENCHMARK_ENABLE_TESTING Off"
 )
 
@@ -463,11 +454,8 @@ endif()
 ### [Lua](https://www.lua.org)
 
 ```cmake
-CPMAddPackage(
-  NAME lua
-  GIT_REPOSITORY https://github.com/lua/lua.git
-  VERSION 5.3.5
-  DOWNLOAD_ONLY YES
+CPMAddPackage("gh:lua/[email protected]"
+    DOWNLOAD_ONLY YES
 )
 
 if (lua_ADDED)