How to view the shader file srp

Srp file contains most of the form:

#include "Packages/com.unity.render-pipelines.core/ShaderLibrary/Shadow/ShadowSamplingTent.hlsl"

Long, where the document it? In unity there is not a project, but in the unity of the installation directory:
For example, to Unity2018.3.0f2 as an example:
D: \ Program Files \ Unity2018.3.0f2 \ Unity \ Editor \ the Data \ Resources \ PackageManager \ Editor \ Package Penalty for \ ShaderLibrary

enlightened, a look found the treasure:

these inside, contains a lot of shader, and cginc, libraries, and so on, can be treasures ah. . .