Fix code samples (#720)

Author: curquiza

.code-samples.meilisearch.yaml

@@ -91,13 +91,13 @@ reset_settings_1: |-
 get_synonyms_1: |-
   client.index('movies').getSynonyms()
 update_synonyms_1: |-
-  client.index('movies').updateSynonym({
+  client.index('movies').updateSynonyms({
     wolverine: ['xmen', 'logan'],
     logan: ['wolverine', 'xmen'],
     wow: ['world of warcraft']
   })
 reset_synonyms_1: |-
-  client.index('movies').resetSynonym()
+  client.index('movies').resetSynonyms()
 get_stop_words_1: |-
   client.index('movies').getStopWords()
 update_stop_words_1: |-

README.md

@@ -415,11 +415,11 @@ Or using the index object:
 
 - Update synonyms:
 
-`index.updateSynonym(synonyms: object): Promise<EnqueuedUpdate>`
+`index.updateSynonyms(synonyms: object): Promise<EnqueuedUpdate>`
 
 - Reset synonyms:
 
-`index.resetSynonym(): Promise<EnqueuedUpdate>`
+`index.resetSynonyms(): Promise<EnqueuedUpdate>`
 
 ### Stop-words <!-- omit in toc -->