Various minor documentation fixes

... picked up along the way.

src/Files/File.php

@@ -2496,7 +2496,7 @@ public function hasCondition($stackPtr, $types)
      * @param int        $stackPtr The position of the token we are checking.
      * @param int|string $type     The type of token to search for.
      * @param bool       $first    If TRUE, will return the matched condition
-     *                             furtherest away from the passed token.
+     *                             furthest away from the passed token.
      *                             If FALSE, will return the matched condition
      *                             closest to the passed token.
      *

src/Fixer.php

@@ -743,7 +743,7 @@ public function addContentBefore($stackPtr, $content)
      * @param int $change The number of spaces to adjust the indent by
      *                    (positive or negative).
      *
-     * @return bool If the change was accepted.
+     * @return void
      */
     public function changeCodeBlockIndent($start, $end, $change)
     {

src/Standards/Generic/Sniffs/CodeAnalysis/UnconditionalIfStatementSniff.php

@@ -63,7 +63,7 @@ public function process(File $phpcsFile, $stackPtr)
         $tokens = $phpcsFile->getTokens();
         $token  = $tokens[$stackPtr];
 
-        // Skip for-loop without body.
+        // Skip if statement without body.
         if (isset($token['parenthesis_opener']) === false) {
             return;
         }

src/Tokenizers/PHP.php

@@ -828,7 +828,7 @@ protected function tokenize($string)
                 && $tokens[($stackPtr + 2)][0] === T_STRING
                 && strtolower($tokens[($stackPtr + 2)][1]) === 'from'
             ) {
-                // Could be multi-line, so just the token stack.
+                // Could be multi-line, so adjust the token stack.
                 $token[0]  = T_YIELD_FROM;
                 $token[1] .= $tokens[($stackPtr + 1)][1].$tokens[($stackPtr + 2)][1];
 
@@ -960,7 +960,7 @@ protected function tokenize($string)
             /*
                 Before PHP 7, the ??= operator was tokenized as
                 T_INLINE_THEN, T_INLINE_THEN, T_EQUAL.
-                Between PHP 7.0 and 7.2, the ??= operator was tokenized as
+                Between PHP 7.0 and 7.3, the ??= operator was tokenized as
                 T_COALESCE, T_EQUAL.
                 So look for and combine these tokens in earlier versions.
             */
@@ -1372,7 +1372,7 @@ function return types. We want to keep the parenthesis map clean,
 
                             if (is_array($tokens[$x]) === false && $tokens[$x] === '?') {
                                 // Found a nullable operator, so skip it.
-                                // But also covert the token to save the tokenizer
+                                // But also convert the token to save the tokenizer
                                 // a bit of time later on.
                                 $tokens[$x] = [
                                     T_NULLABLE,

tests/Core/File/IsReferenceTest.php

@@ -16,7 +16,7 @@ class IsReferenceTest extends AbstractMethodUnitTest
 
 
     /**
-     * Test a class that extends another.
+     * Test correctly identifying whether a "bitwise and" token is a reference or not.
      *
      * @param string $identifier Comment which precedes the test case.
      * @param bool   $expected   Expected function output.