Update explainErrorAtPoint method name.

autoload/LanguageClient.vim

@@ -892,7 +892,7 @@ function! LanguageClient#explainErrorAtPoint(...) abort
                 \ 'handle': s:IsFalse(l:Callback),
                 \ }
     call extend(l:params, get(a:000, 0, {}))
-    return LanguageClient#Call('$languageClient/explainErrorAtPoint', l:params, l:Callback)
+    return LanguageClient#Call('languageClient/explainErrorAtPoint', l:params, l:Callback)
 endfunction
 
 let g:LanguageClient_omniCompleteResults = []

src/types.rs

@@ -18,7 +18,7 @@ pub const REQUEST__SetLoggingLevel: &str = "languageClient/setLoggingLevel";
 pub const REQUEST__RegisterHandlers: &str = "languageClient/registerHandlers";
 pub const REQUEST__NCMRefresh: &str = "LanguageClient_NCMRefresh";
 pub const REQUEST__NCM2OnComplete: &str = "LanguageClient_NCM2OnComplete";
-pub const REQUEST__ExplainErrorAtPoint: &str = "$languageClient/explainErrorAtPoint";
+pub const REQUEST__ExplainErrorAtPoint: &str = "languageClient/explainErrorAtPoint";
 pub const REQUEST__FindLocations: &str = "languageClient/findLocations";
 pub const NOTIFICATION__HandleBufNewFile: &str = "languageClient/handleBufNewFile";
 pub const NOTIFICATION__HandleBufReadPost: &str = "languageClient/handleBufReadPost";