Fix MD040 warnings

The following warnings are generated by using markdownlint analysis:
```
MD040/fenced-code-language Fenced code blocks should have a language specified [Context: "```"]
```
Refer to markdown-lint [1] to fix MD040
[1]: https://github.com/updownpress/markdown-lint/blob/master/rules/040-fenced-code-language.md

Signed-off-by: George Liu <liuxiwei@ieisystem.com>
Change-Id: I3106563ab231739d23314fc11de30082e959b87e
diff --git a/README.md b/README.md
index 6983a8a..d4524f2 100644
--- a/README.md
+++ b/README.md
@@ -136,12 +136,12 @@
 
 ### Two Margin Sensors Into Three Fans (Non-Step PID)
 
-```
 A single zone system where multiple margin thermal sensors are fed into one PID
 that generates the output RPM for a set of fans controlled by one PID.
 
 margin sensors as input to thermal pid
 
+```text
 fleeting0+---->+-------+    +-------+     Thermal PID sampled
                |  min()+--->+  PID  |     slower rate.
 fleeting1+---->+-------+    +---+---+
diff --git a/configure.md b/configure.md
index 02752ca..311630a 100644
--- a/configure.md
+++ b/configure.md
@@ -40,7 +40,7 @@
 
 ### Sensors
 
-```
+```json
 "sensors" : [
     {
         "name": "fan1",
@@ -109,7 +109,7 @@
 writes over dbus to the `xyz.openbmc_project.Control.FanPwm` interface. The
 `writePath` should be the full object path.
 
-```
+```text
 busctl introspect xyz.openbmc_project.Hwmon-1644477290.Hwmon1 /xyz/openbmc_project/sensors/fan_tach/fan1 --no-pager
 NAME                                TYPE      SIGNATURE RESULT/VALUE                             FLAGS
 org.freedesktop.DBus.Introspectable interface -         -                                        -
@@ -157,7 +157,7 @@
 
 ### Zones
 
-```
+```json
 "zones" : [
         {
             "id": 1,
@@ -253,13 +253,15 @@
 
 #### type == "fan"
 
-```
-"name": "fan1-5",
-"type": "fan",
-"inputs": ["fan1", "fan5"],
-"setpoint": 90.0,
-"pid": {
-...
+```json
+{
+  "name": "fan1-5",
+  "type": "fan",
+  "inputs": ["fan1", "fan5"],
+  "setpoint": 90.0,
+  "pid": {
+  ...
+  }
 }
 ```
 
@@ -275,13 +277,15 @@
 
 #### type == "margin"
 
-```
-"name": "fleetingpid0",
-"type": "margin",
-"inputs": ["fleeting0"],
-"setpoint": 10,
-"pid": {
-...
+```json
+{
+  "name": "fleetingpid0",
+  "type": "margin",
+  "inputs": ["fleeting0"],
+  "setpoint": 10,
+  "pid": {
+  ...
+  }
 }
 ```
 
@@ -314,25 +318,27 @@
 
 #### type == "stepwise"
 
-```
-"name": "temp1",
-"type": "stepwise",
-"inputs": ["temp1"],
-"setpoint": 30.0,
-"pid": {
-  "samplePeriod": 0.1,
-  "positiveHysteresis": 1.0,
-  "negativeHysteresis": 1.0,
-  "isCeiling": false,
-  "reading": {
-    "0": 45,
-    "1": 46,
-    "2": 47,
-  },
-  "output": {
-    "0": 5000,
-    "1": 2400,
-    "2": 2600,
+```json
+{
+  "name": "temp1",
+  "type": "stepwise",
+  "inputs": ["temp1"],
+  "setpoint": 30.0,
+  "pid": {
+    "samplePeriod": 0.1,
+    "positiveHysteresis": 1.0,
+    "negativeHysteresis": 1.0,
+    "isCeiling": false,
+    "reading": {
+      "0": 45,
+      "1": 46,
+      "2": 47
+    },
+    "output": {
+      "0": 5000,
+      "1": 2400,
+      "2": 2600
+    }
   }
 }
 ```
diff --git a/tuning.md b/tuning.md
index 1fa8f08..718b784 100644
--- a/tuning.md
+++ b/tuning.md
@@ -21,7 +21,7 @@
 `/usr/share/swampd/config.json`, one can modify the PID parameters in the config
 file and restart the daemon to make the new values effective.
 
-```
+```sh
 systemctl restart phosphor-pid-control.service
 ```
 
@@ -30,7 +30,7 @@
 Flag `"-l \<path\>"` can be specified to enable the daemon to log fan control
 data into `path`. The log output is in CSV format with the following header:
 
-```
+```sh
 epoch_ms,setpt,fan1,fan2,...fanN,fleeting,failsafe
 ```