Fix RAM disk FAQ formatting and add Linux/Windows examples

Author: Devankguptaa

docs/cpp/faq-cpp.md

@@ -102,6 +102,25 @@ By default, the cache lives under your user cache directory (Windows: `%LocalApp
 diskutil erasevolume APFS "vsc-ipch" $(hdiutil attach -nomount ram://8388608)
 # Then set: "C_Cpp.intelliSenseCachePath": "/Volumes/vsc-ipch/cpptools-ipch"
 # Optionally: "C_Cpp.intelliSenseCacheSize": 2048
+```
+
+**Linux (tmpfs, ~4 GB):**
+```bash
+sudo mkdir -p /mnt/vsc-ipch
+sudo mount -t tmpfs -o size=4G,mode=1777 tmpfs /mnt/vsc-ipch
+# Then set: "C_Cpp.intelliSenseCachePath": "/mnt/vsc-ipch/cpptools-ipch"
+```
+
+
+**Windows:**
+Windows doesn’t include a built-in RAM disk. If allowed, create one (for example with ImDisk) and set:
+```json
+"C_Cpp.intelliSenseCachePath": "R:\\vscode-cpptools\\ipch",
+"C_Cpp.intelliSenseCacheSize": 2048
+
+```
+
+
 
 
 ## How do I set up debugging?