Update sonic command doc to add CLIs relative to SONiC fips (sonic-net#2377)

What I did
Update sonic command doc to add CLIs relative to SONiC fips.
See https://github.com/sonic-net/SONiC/blob/master/doc/fips/SONiC-OpenSSL-FIPS-140-3.md

Author: xumia

doc/Command-Reference.md

@@ -10470,6 +10470,39 @@ This command removes all unused images from the device, leaving only the current
   No image(s) to remove
   ```
 
+**sonic-installer get-fips**
+
+This command is used to get the fips status.
+
+- Usage:
+  ```
+  sonic-installer get-fips [<image_name>]
+  ```
+If the image is not specified, the next boot image will be used.
+
+- Example:
+  ```
+  admin@sonic:~$ sudo sonic-installer get-fips
+  FIPS is enabled
+  ```
+
+**sonic-installer set-fips**
+
+The command is used to enable or disable the fips.
+
+- Usage:
+  ```
+  sonic-installer set-fips [--enable-fips|--disable-fips] [<image_name>]
+  ```
+If the option --enable-fips or --disable-fips is not specified, the default behavior is to enable fips.
+
+- Example:
+  ```
+  admin@sonic:~$ sudo sonic-installer set-fips --enable-fips
+  Done
+  Set FIPS for the image successfully
+  ```
+
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