Format demo code in reference

Some of the library reference pages provide code demonstrating usage. In some places, this code had a very odd
formatting where the first indent was three spaces, followed by the standard two space indent for the rest. This made
the structure of the code difficult to follow and also results in an unexpected diff when the user runs the formatter on the
code in Arduino IDE or Web Editor. It also makes it unfriendly to contributors.

All code in the reference is hereby formatted to be compliant with the Arduino IDE 2.x auto formatter (which uses a
configuration equivalent that of the formatters in Arduino IDE 1.x and Arduino Web Editor).

Author: per1234

docs/api.md

@@ -669,29 +669,29 @@ void loop() {
 }
 
 void printDirectory(File dir, int numTabs) {
-   while(true) {
-
-     File entry =  dir.openNextFile();
-     if (! entry) {
-       // No more files
-       // Serial.println("**nomorefiles**");
-       break;
-     }
-
-     for (uint8_t i=0; i<numTabs; i++) {
-       Serial.print('\t');
-     }
-
-     Serial.print(entry.name());
-     if (entry.isDirectory()) {
-       Serial.println("/");
-       printDirectory(entry, numTabs+1);
-     } else {
-       // Files have sizes, directories do not
-       Serial.print("\t\t");
-       Serial.println(entry.size(), DEC);
-     }
-   }
+  while (true) {
+
+    File entry = dir.openNextFile();
+    if (!entry) {
+      // No more files
+      // Serial.println("**nomorefiles**");
+      break;
+    }
+
+    for (uint8_t i = 0; i < numTabs; i++) {
+      Serial.print('\t');
+    }
+
+    Serial.print(entry.name());
+    if (entry.isDirectory()) {
+      Serial.println("/");
+      printDirectory(entry, numTabs + 1);
+    } else {
+      // Files have sizes, directories do not
+      Serial.print("\t\t");
+      Serial.println(entry.size(), DEC);
+    }
+  }
 }
 ```
 
@@ -745,7 +745,7 @@ void setup() {
   delay(2000);
 
   Serial.println();
-  Serial.println("Rewinding, and repeating below:" );
+  Serial.println("Rewinding, and repeating below:");
   Serial.println();
   delay(2000);
 
@@ -761,7 +761,7 @@ void loop() {
 void printDirectory(File dir, int numTabs) {
   while (true) {
     File entry = dir.openNextFile();
-    if (! entry) {
+    if (!entry) {
       if (numTabs == 0)
         Serial.println("** Done **");
       return;
@@ -841,29 +841,29 @@ void loop() {
 }
 
 void printDirectory(File dir, int numTabs) {
-   while(true) {
-     File entry =  dir.openNextFile();
-     if (! entry) {
-       // No more files
-       // Return to the first file in the directory
-       dir.rewindDirectory();
-       break;
-     }
-
-     for (uint8_t i=0; i<numTabs; i++) {
-       Serial.print('\t');
-     }
-
-     Serial.print(entry.name());
-     if (entry.isDirectory()) {
-       Serial.println("/");
-       printDirectory(entry, numTabs+1);
-     } else {
-       // Files have sizes, directories do not
-       Serial.print("\t\t");
-       Serial.println(entry.size(), DEC);
-     }
-   }
+  while (true) {
+    File entry = dir.openNextFile();
+    if (!entry) {
+      // No more files
+      // Return to the first file in the directory
+      dir.rewindDirectory();
+      break;
+    }
+
+    for (uint8_t i = 0; i < numTabs; i++) {
+      Serial.print('\t');
+    }
+
+    Serial.print(entry.name());
+    if (entry.isDirectory()) {
+      Serial.println("/");
+      printDirectory(entry, numTabs + 1);
+    } else {
+      // Files have sizes, directories do not
+      Serial.print("\t\t");
+      Serial.println(entry.size(), DEC);
+    }
+  }
 }
 ```