Fixed capitalization of subsections in chapter 7. Response

[rivantsov]

Changed capitalization of subsections to first-cap style like in the rest of the doc

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[benjie]

Notes from the Dec APAC WG: thanks for spotting this inconsistency. We need to decide on a style guide for the spec and then uniformly apply it across the entire document for all **...** titles. If title case, we should have a concrete style guide such as the Chicago style guide or the New York Times style guide so we know which words to capitalise and which not to.

[benjie]

I've used:

$ grep -hr '^\*\*.*\*\*$' . | sort -u

To pull out all the titles of this format. They roughly sort into:

Title case

Seems like deliberate title case.

**Circular References**
**Coercing Results**
**Conforming Algorithms**
**Delivery Agnostic**
**Escape Sequences**
**Explanatory Text**
**Field Ordering**
**First Class Documentation**
**Formal Specification**
**Interfaces Implementing Interfaces**
**Lexical Analysis & Syntactic Parse**
**Lookahead Restrictions**
**Non-Normative Portions**
**Parameterized Grammar Productions**
**Static Semantics**
**Supporting Subscriptions at Scale**

Title case via keywords

Seems like title case but could just be that capitalised keywords such as Non-Null Fields are used, having the effect of title case.

**Block Strings**
**Built-in Directives**
**Built-in Scalars**
**Custom Directives**
**Custom Scalars**
**Default Root Operation Type Names**
**Errors and Non-Null Fields**
**Event Streams**
**Input Coercion**
**Input Object**
**Merging Selection Sets**
**Nullable vs. Optional**
**Optionality and Lists**
**Reserved Names**
**Resolving Abstract Types**
**Result Coercion and Serialization**
**Result Coercion**
**Schema Introspection Schema**
**Schema Validation**
**Type Validation**

Sentence case

Unambiguously sentence case.

**Allowing optional variables when default values exist**
**Arguments are unordered**
**Byte order mark**
**Copyright notice**
**Directive order is significant**
**Error result format**
**Field errors**
**Input object fields are unordered**
**Query shorthand**
**Request errors**
**Type system evolution**

Sentence case except keywords

Capitalisation of keywords (Spreads, Interface Scope, Fragments) but sentence case for the rest.

**Interface Spreads in implemented Interface Scope**
**Variable use within Fragments**

Indeterminate

Single words don't sway one way or the other.

**Conformance**
**Constraints**
**Deprecation**
**Enum**
**Examples**
**Interface**
**Introduction**
**Licensing**
**List**
**Non-Null**
**Object**
**Scalar**
**Semantics**
**Union**
**Validation**

One more thing...

There's inconsistency on whether we should capitalise after a hyphen; e.g. we have Built-in but Non-Null. Again this is something a style guide should dictate.

[benjie]

After a deeper analysis, I have proposed this: https://github.com/graphql/graphql-spec/pull/1003

[rivantsov]

Perfect!

[rivantsov]

Since the new style guide sets the Title case for headings, this PR fixes the remaining non-conforming headers to Title case, so it is ready to merge.