Fix formatting in extractall example outputs (#40354)

Author: TheNeuralBit

pandas/core/strings/accessor.py

@@ -2372,7 +2372,7 @@ def extractall(self, pat, flags=0):
                 0
         match
         A 0      1
-        1      2
+          1      2
         B 0      1
 
         Capture group names are used for column names of the result.
@@ -2381,7 +2381,7 @@ def extractall(self, pat, flags=0):
                 digit
         match
         A 0         1
-        1         2
+          1         2
         B 0         1
 
         A pattern with two groups will return a DataFrame with two columns.
@@ -2390,7 +2390,7 @@ def extractall(self, pat, flags=0):
                 letter digit
         match
         A 0          a     1
-        1          a     2
+          1          a     2
         B 0          b     1
 
         Optional groups that do not match are NaN in the result.
@@ -2399,7 +2399,7 @@ def extractall(self, pat, flags=0):
                 letter digit
         match
         A 0          a     1
-        1          a     2
+          1          a     2
         B 0          b     1
         C 0        NaN     1
         """