Duplicate/mislabeled `isdecimal()` section

## Duplicate/mislabeled `isdecimal()` section

**File**

`30-Days-Of-Python/04_Day_Strings/day_4.py`

**Description**

There's a duplicate and incorrectly labeled `isdecimal()` section at line 162. It's actually showing `find()` examples, not `isdecimal()`.

**Current content at line 162**

```python
# isdecimal(): Checks Decimal Characters

challenge = 'thirty days of python'
print(challenge.find('y'))  # 5
print(challenge.find('th'))  # 0
```

**Why this is a problem**

1. This section is labeled `isdecimal()` but demonstrates the `find()` method instead.
2. `find()` is already correctly demonstrated earlier, at line 115:

```python
# find(): Returns the index of first occurrence of substring

challenge = 'thirty days of python'
print(challenge.find('y'))  # 5
print(challenge.find('th'))  # 0
```

3. The correct `isdecimal()` example already exists at line 175:

```python
# isdecimal(): Checks decimal characters

num = '10'
print(num.isdecimal())  # True
num = '10.5'
print(num.isdecimal())  # False
```

**Requested change**

Could someone remove the duplicate, mislabeled `isdecimal()` section at line 162? Since `find()` is already demonstrated at line 115 and the correct `isdecimal()` example remains at line 175, this section is redundant and should just be deleted to keep each string method example in its appropriate place.


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Duplicate/mislabeled `isdecimal()` section #924