JS doc typo fixes. No functional changes.

FossilOrigin-Name: e0d9c74c1cdddb2321131255b94f9cda6530be3f2a06aed4abb54dcda092481e

ext/wasm/common/whwasmutil.js

@@ -51,7 +51,7 @@
 
    Its global-scope symbol is intended only to provide an easy way to
    make it available to 3rd-party scripts and "should" be deleted
-   after calling it. That symbols is _not_ used within the library.
+   after calling it. That symbol is _not_ used within the library.
 
    Forewarning: this API explicitly targets only browser
    environments. If a given non-browser environment has the
@@ -69,7 +69,8 @@
    - WASM-exported "indirect function table" access and
      manipulation. e.g.  creating new WASM-side functions using JS
      functions, analog to Emscripten's addFunction() and
-     uninstallFunction() but slightly different.
+     uninstallFunction() but slightly different and with more useful
+     lifetime semantics.
 
    - Get/set specific heap memory values, analog to Emscripten's
      getValue() and setValue().
@@ -165,7 +166,7 @@
    This code is developed and maintained in conjunction with the
    Jaccwabyt project:
 
-   https://fossil.wanderinghorse.net/r/jaccwabbyt
+   https://fossil.wanderinghorse.net/r/jaccwabyt
 
    More specifically:
 
@@ -1627,7 +1628,7 @@ globalThis.WhWasmUtilInstaller = function(target){
        need a level of hand-written wrappers around them, depending on
        how they're used, in order to provide the client with JS
        strings. Alternately, clients will need to perform such conversions
-       on their own, e.g. using cstrtojs(). Or maybe we can find a way
+       on their own, e.g. using cstrToJs(). Or maybe we can find a way
        to perform such conversions here, via addition of an xWrap()-style
        function signature to the options argument.
   */