Typo, spacing error and expected/actual pattern

Co-authored-by: András B Nagy <[email protected]>

exercises/practice/run-length-encoding/run_length_encoding.vader

@@ -14,17 +14,17 @@ Execute (encode two letters that repeat):
   AssertEqual g:expected, g:actual
 
 Execute (encode three letters that repeat):
-  let g:encoded = Encode('aaa')
+  let g:actual = Encode('aaa')
   let g:expected = '3a'
   AssertEqual g:expected, g:actual
 
 Execute (encode abaabbbabaaa):
-  let g:encoded = Encode('abaabbbabaaa')
+  let g:actual = Encode('abaabbbabaaa')
   let g:expected = 'ab2a3bab3a'
   AssertEqual g:expected, g:actual
 
 Execute (encode a very long text):
-  let g:encoded = Encode('aabbccddeeffgghhiijjkkllmmnnooppqqrrssttuuvvwwxxyyzz')
+  let g:actual = Encode('aabbccddeeffgghhiijjkkllmmnnooppqqrrssttuuvvwwxxyyzz')
   let g:expected = '2a2b2c2d2e2f2g2h2i2j2k2l2m2n2o2p2q2r2s2t2u2v2w2x2y2z2'
   AssertEqual g:expected, g:actual
 
@@ -40,12 +40,12 @@ Execute (encode single characters only are encoded without count):
 
 Execute (encode text with no single characters):
   let g:actual = Encode('AABBBCCCC')
-  let g: expected = '2A3B4C'
+  let g:expected = '2A3B4C'
   AssertEqual g:expected, g:actual
 
 Execute (encode single characters with repeated characters):
   let g:actual = Encode('WWWWWWWWWWWWBWWWWWWWWWWWWBBBWWWWWWWWWWWWWWWWWWWWWWWWB')
-  let g: expected = '12WB12W3B24WB'
+  let g:expected = '12WB12W3B24WB'
   AssertEqual g:expected, g:actual
 
 Execute (encode multiple whitespace mixed in text):
@@ -58,7 +58,7 @@ Execute (encode lowercase characters):
   let g:expected = '2a3b4c'
   AssertEqual g:expected, g:actual
 
-Execute (encde and then decode empty text gives empty text):
+Execute (encode and then decode empty text gives empty text):
   let g:actual = Decode(Encode(''))
   let g:expected = ''
   AssertEqual g:expected, g:actual