Fix plantuml diagrams (#3256)

Resolves #3254

Author: p7nov

doc/dev_guide/internals/iproto/images/auth.puml

@@ -1,6 +1,6 @@
 @startuml
 
-skinparam map {
+skinparam {
     HyperlinkColor #0077FF
     FontColor #313131
     BorderColor #313131

doc/dev_guide/internals/iproto/images/auth.svg

@@ -1,6 +1,6 @@
 @startuml
 
-skinparam map {
+skinparam {
     HyperlinkColor #0077FF
     FontColor #313131
     BorderColor #313131

doc/dev_guide/internals/iproto/images/body.puml

@@ -1,6 +1,6 @@
 @startuml
 
-skinparam map {
+skinparam {
     HyperlinkColor #0077FF
     FontColor #313131
     BorderColor #313131
@@ -22,12 +22,12 @@ json "**IPROTO_CALL**" as call_request {
 json "**Response to IPROTO_CALL**" as call_response {
     "Size": "MP_UINT",
     "Header": {
-      "[[tarantool.io/en/doc/latest/dev_guide/internals/iproto/keys IPROTO_REQUEST_TYPE]]": "IPROTO_OK",
-      "[[tarantool.io/en/doc/latest/dev_guide/internals/iproto/keys IPROTO_SYNC]]": "MP_UINT",
-      "[[tarantool.io/en/doc/latest/dev_guide/internals/iproto/keys IPROTO_SCHEMA_VERSION]]": "MP_UINT"
+      "[[https://tarantool.io/en/doc/latest/dev_guide/internals/iproto/keys IPROTO_REQUEST_TYPE]]": "IPROTO_OK",
+      "[[https://tarantool.io/en/doc/latest/dev_guide/internals/iproto/keys IPROTO_SYNC]]": "MP_UINT",
+      "[[https://tarantool.io/en/doc/latest/dev_guide/internals/iproto/keys IPROTO_SCHEMA_VERSION]]": "MP_UINT"
     },
     "Body": {
-      "[[tarantool.io/en/doc/latest/dev_guide/internals/iproto/keys IPROTO_DATA]]": "MP_OBJECT"
+      "[[https://tarantool.io/en/doc/latest/dev_guide/internals/iproto/keys IPROTO_DATA]]": "MP_OBJECT"
     }
 }