Fix the comments

Author: MarcellPerger1

src/test/java/net/marcellperger/mathexpr/MathSymbolTest.java

@@ -20,7 +20,6 @@ void test_fmt() {
 
     @Test
     void test_fmt__pow() {
-        // TODO decide spacing: `2.2**3.1` or `2.2 ** 3.1`
         assertExprFmt(new ObjStringPair(new PowOperation(new BasicDoubleSymbol(0.2), new BasicDoubleSymbol(5.5)), "0.2**5.5"));
         assertExprFmt(new ObjStringPair(new PowOperation(new PowOperation(new BasicDoubleSymbol(0.2), new BasicDoubleSymbol(5.5)), new BasicDoubleSymbol(3.3)),
             "(0.2**5.5)**3.3"));

src/test/java/net/marcellperger/mathexpr/parser/ParserTest.java

@@ -213,7 +213,7 @@ public void close() {
             restoreCache();
         }
 
-        // region implementation details (ctor, clearCache, restoreCache
+        // region implementation details (ctor, clearCache, restoreCache)
         private WithSuppressingCache() {}
 
         private Map<SymbolInfo, Optional<BinOpBiConstructor>> origCache = null;