docs(101): heading capitalization, formatting

docs/chapters/101/README.md

@@ -52,23 +52,23 @@ You can think of a Document like a chocolate bar. Documents have different forma
 
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-<h2 align="center">YAML config</h2>
+<h2 align="center">YAML Config</h2>
 
 <img align="right" src="img/ILLUS2.png?raw=true" alt="Jina 101 YAML, Copyright by Jina AI Limited" title="Jina 101 YAML Concept, Copyright by Jina AI Limited" hspace="10" width="30%"/>
 
-Every part of Jina is configured with YAML files. YAML files offer customization, allowing you to change the behavior of an object without touching its code. Jina can build a very complicated object directly from a simple YAML file, or save an object into a YAML file.
+Every part of Jina is configured with **YAML files**. YAML files offer customization, allowing you to change the behavior of an object without touching its code. Jina can build a very complicated object directly from a simple YAML file, or save an object into a YAML file.
 
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-<h2 align="center">Executor</h2>
+<h2 align="center">Executors</h2>
 
 <img align="left" src="img/ILLUS3.png?raw=true" alt="Jina AI Executor, Copyright by Jina AI Limited" title="Jina AI Executor Concept, Copyright by Jina AI Limited" hspace="10" width="30%"/>
 
 How do we break down a Document into Chunks, and what happens next? **Executors** do all of this hard work, and each represents an algorithmic unit. They do things like encoding images into vectors, storing vectors on disk, ranking results, and so on. Each one has a simple interface, letting you concentrate on the algorithm and not get lost in the weeds. They feature persistence, scheduling, chaining, grouping, and parallelization out of the box. The properties of an Executor are stored in a [YAML file](#configuring-jina-with-yaml). They always go hand in hand.
 
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-<h3 align="center">Family of Executors</h3>
+<h3 align="center">The Executor Family</h3>
 
 
 <p align="center">
@@ -85,7 +85,7 @@ Got a new algorithm in mind? No problem, this family always welcomes new members
 
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-<h2 align="center">Driver</h2>
+<h2 align="center">Drivers</h2>
 
 <img align="right" src="img/ILLUS5.png?raw=true" alt="Jina 101 Driver, Copyright by Jina AI Limited" title="Jina 101 Driver, Copyright by Jina AI Limited" hspace="10" width="30%"/>
 
@@ -95,7 +95,7 @@ Executors do all the hard work, but they're not great at talking to each other.
 
 
 
-<h2 align="center">Pea</h2>
+<h2 align="center">Peas</h2>
 
 <img align="left" src="img/ILLUS6.png?raw=true" alt="Jina 101 Pea, Copyright by Jina AI Limited" title="Jina 101 Pea, Copyright by Jina AI Limited" hspace="10" width="30%"/>
 
@@ -109,7 +109,7 @@ While a Driver translates data for an Executor, A Pea wraps an Executor and lets
 
 
 
-<h2 align="center">Pod</h2>
+<h2 align="center">Pods</h2>
 
 <img align="left" src="img/ILLUS8.png?raw=true" alt="Jina 101 Pod, Copyright by Jina AI Limited" title="Jina 101 Pod, Copyright by Jina AI Limited" hspace="10" width="30%"/>