Fix documentation comments for the Container. (#4178)

Author: ryanwilson

Firebase/Core/FIRComponentContainer.m

@@ -25,7 +25,7 @@
 
 @interface FIRComponentContainer ()
 
-/// The dictionary of components that are registered for a particular app. The key is an NSString
+/// The dictionary of components that are registered for a particular app. The key is an `NSString`
 /// of the protocol.
 @property(nonatomic, strong) NSMutableDictionary<NSString *, FIRComponentCreationBlock> *components;
 

Firebase/Core/Private/FIRComponentContainerInternal.h

@@ -24,11 +24,11 @@ NS_ASSUME_NONNULL_BEGIN
 
 @interface FIRComponentContainer (Private)
 
-/// Initializes a contain for a given app. This should only be called by the app itself.
+/// Initializes a container for a given app. This should only be called by the app itself.
 - (instancetype)initWithApp:(FIRApp *)app;
 
 /// Retrieves an instance that conforms to the specified protocol. This will return `nil` if the
-/// protocol wasn't registered, or if the instance couldn't instantiate for the provided app.
+/// protocol wasn't registered, or if the instance couldn't be instantiated for the provided app.
 - (nullable id)instanceForProtocol:(Protocol *)protocol NS_SWIFT_NAME(instance(for:));
 
 /// Instantiates all the components that have registered as "eager" after initialization.

GoogleUtilitiesComponents/Sources/GULCCComponentContainer.m

@@ -27,7 +27,7 @@
 
 @interface GULCCComponentContainer ()
 
-/// The dictionary of components that are registered for a particular app. The key is an NSString
+/// The dictionary of components that are registered for a particular app. The key is an `NSString`
 /// of the protocol.
 @property(nonatomic, strong)
     NSMutableDictionary<NSString *, GULCCComponentCreationBlock> *components;

GoogleUtilitiesComponents/Sources/Private/GULCCComponentContainerInternal.h

@@ -22,15 +22,15 @@ NS_ASSUME_NONNULL_BEGIN
 
 @interface GULCCComponentContainer (Private)
 
-/// Initializes a contain with a context.
+/// Initializes a container with a context.
 - (instancetype)initWithContext:(nullable id)context;
 
-/// Initializes a contain with a context and a given set of registered `GULLibraries`.
+/// Initializes a container with a context and a given set of registered `GULLibraries`.
 - (instancetype)initWithContext:(nullable id)context
                     registrants:(NSMutableSet<Class> *)allRegistrants;
 
 /// Retrieves an instance that conforms to the specified protocol. This will return `nil` if the
-/// protocol wasn't registered, or if the instance couldn't instantiate for the provided app.
+/// protocol wasn't registered, or if the instance couldn't be instantiated for the provided app.
 - (nullable id)instanceForProtocol:(Protocol *)protocol NS_SWIFT_NAME(instance(for:));
 
 /// Instantiates all the components that have registered as "eager" after initialization.