doc: align Launch App doc variable naming with sample code

Align the Launch App documentation snippet variable name
with the record_launch_app sample for consistency.
Additionally align formatting in code snippets.

Signed-off-by: Marcin Gasiorek <marcin.gasiorek@nordicsemi.no>

Author: MarGasiorek

doc/nrf/libraries/nfc/ndef/launchapp.rst

@@ -36,16 +36,16 @@ The following code snippets show how to generate a Launch App message.
 
       int err;
 
-      err = nfc_launchapp_msg_encode(android_package_name,
-        			  sizeof(android_package_name),
-        			  universal_link,
-        			  sizeof(universal_link),
-        			  ndef_msg_buf,
-        			  &len);
+      err = nfc_launchapp_msg_encode(android_pkg_name,
+			            sizeof(android_pkg_name),
+			            universal_link,
+			            sizeof(universal_link),
+			            ndef_msg_buf,
+			            &len);
 
       if (err < 0) {
-           printk("Cannot encode message!\n");
-           return err;
+	      printk("Cannot encode message!\n");
+	      return err;
       }
 
    Provide the following parameters:

doc/nrf/libraries/nfc/ndef/msg_parser.rst

@@ -29,12 +29,12 @@ The following code example shows how to parse an NDEF message, after you have us
    size_t desc_buf_len = sizeof(desc_buf);
 
    err = nfc_ndef_msg_parse(desc_buf,
-                            &desc_buf_len,
-			    ndef_msg_buff,
-			    &nfc_data_len);
+		             &desc_buf_len,
+		             ndef_msg_buff,
+		             &nfc_data_len);
 
    if (err) {
-        printk("Error during parsing an NDEF message, err: %d.\n", err);
+	      printk("Error during parsing an NDEF message, err: %d.\n", err);
    }
 
    nfc_ndef_msg_printout((struct nfc_ndef_msg_desc *) desc_buf);

doc/nrf/libraries/nfc/ndef/text_rec.rst

@@ -60,10 +60,10 @@ The following code example shows how to generate a raw text message that contain
 
       err = nfc_ndef_msg_encode(&NFC_NDEF_MSG(nfc_text_msg),
 				            buffer,
-				            len);
+				            &len);
       if (err < 0) {
 	      printk("Cannot encode message!\n");
-          return err;
+	      return err;
       }
 
 API documentation

doc/nrf/libraries/nfc/ndef/uri_msg.rst

@@ -35,13 +35,13 @@ The following code snippets show how to generate a URI message.
       int err;
 
       err = nfc_ndef_uri_msg_encode( NFC_URI_HTTP_WWW,
-                                      m_url,
-                                      sizeof(m_url),
-                                      m_ndef_msg_buf,
-                                      &len);
+				            m_url,
+				            sizeof(m_url),
+				            m_ndef_msg_buf,
+				            &len);
 
       if (err < 0) {
-          printk("Cannot encode message!\n");
+	      printk("Cannot encode message!\n");
 	      return err;
       }