[docs] Explain how to use Kernel-Doc and it's converter on the kernel

- Kernel-Doc documentation in report converter explains the usage
  of kernel-doc tool on kernel sources
- Kernel-Doc is accessible from the main readme file and supported
  code analyzer file
- Kernel-Doc updated in usage

docs/README.md

@@ -109,6 +109,7 @@ The following tools are supported:
 |                | [Facebook Infer](/tools/report-converter/README.md#facebook-infer)    |
 |                | [Coccinelle](/tools/report-converter/README.md#coccinelle)    |
 |                | [Smatch](/tools/report-converter/README.md#smatch)    |
+|                | [Kernel-Doc](/tools/report-converter/README.md#kernel-doc)    |
 | **Java**       | [SpotBugs](/tools/report-converter/README.md#spotbugs)    |
 |                | [Facebook Infer](/tools/report-converter/README.md#fbinfer)    |
 | **Python**     | [Pylint](/tools/report-converter/README.md#pylint)    |

docs/supported_code_analyzers.md

@@ -17,6 +17,7 @@ CodeChecker result directory which can be stored to a CodeChecker server.
 |                | [Facebook Infer](/tools/report-converter/README.md#fbinfer)    | ✓ |
 |                | [Coccinelle](/tools/report-converter/README.md#coccinelle)   | ✓ |
 |                | [Smatch](/tools/report-converter/README.md#smatch)   | ✓ |
+|                | [Kernel-Doc](/tools/report-converter/README.md#kernel-doc)   | ✓ |
 | **Java**       | [FindBugs](http://findbugs.sourceforge.net/)    | ✗ |
 |                | [SpotBugs](/tools/report-converter/README.md#spotbugs)    | ✓ |
 |                | [Facebook Infer](/tools/report-converter/README.md#fbinfer)    | ✓ |

tools/report-converter/README.md

@@ -22,6 +22,7 @@ a CodeChecker server.
 * [Markdownlint](#markdownlint)
 * [Coccinelle](#coccinelle)
 * [Smatch](#smatch)
+* [Kernel-Doc](#kernel-doc)
 * [License](#license)
 
 ## Install guide
@@ -86,6 +87,7 @@ Supported analyzers:
   eslint - ESLint, https://eslint.org/
   fbinfer - Facebook Infer, https://fbinfer.com
   golint - Golint, https://github.com/golang/lint
+  kernel-doc - Kernel-Doc, https://github.com/torvalds/linux/blob/master/scripts/kernel-doc
   mdl - Markdownlint, https://github.com/markdownlint/markdownlint
   msan - MemorySanitizer, https://clang.llvm.org/docs/MemorySanitizer.html
   pyflakes - Pyflakes, https://github.com/PyCQA/pyflakes
@@ -441,6 +443,33 @@ report-converter -t smatch -o ./codechecker_smatch_reports ./smatch_warns.txt
 CodeChecker store ./codechecker_smatch_reports -n smatch
 ```
 
+## [Kernel-Doc](https://github.com/torvalds/linux/blob/master/scripts/kernel-doc)
+[Kernel-Doc](https://github.com/torvalds/linux/blob/master/scripts/kernel-doc) structure is extracted 
+from the comments, and proper Sphinx C Domain function and type descriptions with anchors are generated 
+from them.The descriptions are filtered for special kernel-doc highlights and cross-references.
+
+The recommended way of running Kernel-Doc is to redirect the output to a file and
+give this file to the report converter tool.
+
+The following example shows you how to run Smatch on kernel sources 
+and store the results found by Kernel-Doc to the CodeChecker database.
+```sh
+# Change Directory to your project
+cd path/to/linux/kernel/repository
+
+# Run Kernel-Doc
+# Note: The output of the following command will be both of sphinx and kernel-doc, 
+# but the parser will parse only kernel-doc output
+make htmldocs 2>&1 | tee kernel-docs.out
+
+# Use 'report-converter' to create a CodeChecker report directory from the
+# analyzer result of Coccicheck
+report-converter -t kernel-doc -o ./codechecker_kernel-doc_reports ./sphinx_output.out
+
+# Store the Kernel-Doc reports with CodeChecker.
+CodeChecker store ./codechecker_kernel-doc_reports -n kernel-doc
+```
+
 ## License
 
 The project is licensed under Apache License v2.0 with LLVM Exceptions.