Replace Riot with Element in docs and comments

This only covers the simple cases of references to issues and repos. More
complex areas, such as deployment scripts, will be handled separately.

Part of https://github.com/vector-im/element-web/issues/14864

src/languageHandler.tsx

@@ -64,7 +64,7 @@ export function _td(s: string): string {
 // Wrapper for counterpart's translation function so that it handles nulls and undefineds properly
 // Takes the same arguments as counterpart.translate()
 function safeCounterpartTranslate(text: string, options?: object) {
-    // Horrible hack to avoid https://github.com/vector-im/riot-web/issues/4191
+    // Horrible hack to avoid https://github.com/vector-im/element-web/issues/4191
     // The interpolation library that counterpart uses does not support undefined/null
     // values and instead will throw an error. This is a problem since everywhere else
     // in JS land passing undefined/null will simply stringify instead, and when converting
@@ -295,7 +295,7 @@ export function replaceByRegexes(text: string, mapping: IVariables | Tags): stri
 
 // Allow overriding the text displayed when no translation exists
 // Currently only used in unit tests to avoid having to load
-// the translations in riot-web
+// the translations in element-web
 export function setMissingEntryGenerator(f: (value: string) => void) {
     counterpart.setMissingEntryGenerator(f);
 }